Chevy 350 Stumbles Under Load

My son used to have a 90 Camero with a 350-tbi. An easy way to check Q-jet metering rods. This is a discussion on [SOLVED] chevy 1500 backfire within the Automotive Support forums, part of the Tech Support Forum category. The truck starts, idles, and revs normally and when accellarating slowly everything works just fine, but once you get past half throttle it falls on its face and acts like it has a clogged fuel filter or bad fuel pump. If the Check Engine Light comes on, you may find any of the following codes: P0171, P0174 Lean fuel condition codes; P0120 to P0124 Throttle position sensor codes. I am not a veterain six tuner, but that problem often shows up for small block guys with the 20 degree vacuum canister on their HEI when they hook the vacuum advance to raw manifold vacuum and set their idle and ignition timing without realizing they should have set the timing with the vac advance disconnected. Carburetor rebuild, throwing parts at, and uncertainty as to this truck being sent to the crusher. [SOLVED] chevy 1500 backfire. Re: 72 chevy 350 running rough under load! A waste to try to explain your timing if you're off trying to find a reason to kill your eddy carb. I notice that my outboard motor tends to stumble or misfire when accelerating under load if the spark plug gap is greater than the specified or recommended spark plug gap. There are over 20 different automotive discussion forums in the iATN members only area, with 2. 1994 Chevy C1500 5. It is part of GM’s third-generation high-feature V6 engine. I'll be driving and when I get up to around 35 - 45 MPH sometimes my truck will stumble and I'll notice the RPMs go down then back up. 7 bogs/backfires when I give it gas. Replaced the engine and it starts and runs fine, until you drive it under load. Also, it may run fine most of the time but suddenly misfire or cut out for no apparent reason. If you have a large cam in this motor maybe try leaning out the idle AFR target as the engine may load up slightly on take off. I've always been told TBI motors are picky with timing that if it's not perfect it won't run right. Could be related to EGR. when car is in park runs bitchen and rev it up no problems or stumbleing seems like only happens under a load. Thought I had a problem with gas, changed fuel filters, had fuel pump checked and added Sea Foam. While a half-ton, like a Ford F-150, Ram 1500 or Chevy Silverado 1500, is enough to pull a fifth wheel, most people who spring for a trailer big enough to warrant a bed-mounted hitch will likely. The 2006 Ford Taurus has 2 problems reported for hesitation/stalls while attempting to accelerate. it stumbles then back. You may notice a bit of a "lean hole" around 5" of vacuum with a 1406. It runs great (idle, rev) in neutral. 40's pretty consistently but always had a stumble and was hard starting. 3 Stumbles on acceleration, rough running Problem Automotive Forums. I have a 355 Chevy in a 86 Monte Carlo. Rebuilding the Small-Block Chevy: Step by Step Videobook is a quality, step-by-step Workbench Book and DVD combination that shows you how to build a street or racing small-block Chevy in your own garage. Check the gap on all the spark plugs. 7 bogs/backfires when I give it gas. 95 Chevy 350 TBI acceleration problems Results 1 to 8 of 8 Discuss 95 Chevy 350 TBI acceleration problems in the alt. Chevrolet Infotainment System functionality varies by model. So i have a chevy 350 i rebuilt recently and have put about 50 miles on it and it ran great. Worse under load and it boots up through the carburetor? It could be timing related, but since it's a Chevy small block, make sure it isn't suffering from a case of the flat cam blues. I have a mid 1970 chevy 350 it pops through the left side bank only @ a steady 2000 rpm. When i took it to the dealer the mechanic couldnt duplicate what i was talking about. oh i forgot to mention it has new plugs also any ideas on this matter?. Carburetor rebuild, throwing parts at, and uncertainty as to this truck being sent to the crusher. first the basics. It should be taken as an indication that there is a problem existing (or developing), that will potentially shorten the engine life, or result in unnecessary costs. Engine is a mild street Chevy 350 with MSD 6AL2 box with pro billet distributor, 670 cfm Holley Street Avenger. Repair Information for P0300 Chevrolet code. Discuss 95 Chevy 350 TBI acceleration problems in the alt. It has a slight miss at idle but gets alto worse under load. But, would a fuel problem present itself when put into gear and not while in neutral. I got a 99 tahoe 5. You guys are great, to answer some of your questions: For lt1s10: It starts and runs good at the current settings (with the exception of the pinging) but I am going to reverify my TDC (hopefully without removing the head) using the #1 sparkplug hole and a technique I found in another forum on the subject. A visual inspection showed that new spark plugs, spark plug wires, ignition cap, and rotor have been installed. Engine Oil Leaking Problems of Chevrolet Cruze Chevrolet Cruze owners have reported 13 problems related to engine oil leaking (under the engine and engine cooling category). Stumbles and runs rough at lower throttle positions (just off idle). Clogged fuel filter or fuel line under the hood or in the tank. During a road test you are able to read and then correct the air/fuel mixture so you can have them correct at idle, cruise/light throttle and full power. GM doesn't use it anymore (too expensive). If the Check Engine Light comes on, you may find any of the following codes: P0171, P0174 Lean fuel condition codes; P0120 to P0124 Throttle position sensor codes. 1999 Yukon - Finally fixed misfire under load at 70 mph Yukon Car Forums I've got the Chevy techs baffled as to why it is happening, so I may give this a shot. 7L engines with throttle body fuel injection system: a stuck open EGR valve. I'm havin the exact same problem with my 89 blazer I haven't looked to much into it because I just got it. Symptoms of a Misfire. 2 problems here. Chevy silverado 5. as it induces a big toss load on them. The answer is the power valve size. Carb is a holley 670sa with factory. When put into Drive or any gear under load it stumbles on itself. The misfire would come and go and has been getting worse. All in which came back ok/no codes. When warm, it would take 3 turns/tries. Ford E-350 Misfire, Hesitation, Rough Running from Engine, Notably After Ignition Wire Replacement - 5 reports. Full functionality requires compatible Bluetooth and smartphone, and USB connectivity for some devices. I don't notice uch of a misfire below 3000 rpms. Im running out of ideas i recently bought a gm crate engine for my 76 blazer ive replaced just about everything on the motor when i bought it (new carb, fuel pump, fuel filter, water pump, alternator, power steering pump, plugs wires cap and rotor) the only things i kept were the intake, distributor, and exhaust manifolds. A few days later it began to stumble and hesitate upon acceleration. SHARAPOVA OUT. I believe it was the engine GM >co-developed with Lotus. 8 (K) engine with TBI. Six-speed WS6 Pontiac is the product of a ’90s GM strike, a paint recall and pure dumb luck. You should have no more than 5 inches Hg at WOT (wide open throttle) or 7-8 inches Hg under load. Worse under load and it boots up through the carburetor? It could be timing related, but since it's a Chevy small block, make sure it isn't suffering from a case of the flat cam blues. There are over 20 different automotive discussion forums in the iATN members only area, with 2. when i drive around town. If I rev it up and hold it at about 2 to 3 thousand rpms its fine and revs up fine. During idle it would sound as if it were about to shut off but it wouldn't. Possibly damaged by a backfire condition. and when i keep my foot in the pedal it doesnt clear up engine is mild 350 with h. Symptoms of a Misfire. at times when it happens i try to mash on it and it lacks power and sputters. Interestingly, unlike other Chevy small block designs, the Gen II engine was never available in any trucks manufactured by GM. I cant win! What am I doing wrong?. Pumping the gas does not help. Hello i have a 1967 el camino 327 small block with a rochester quadrajet carb and a turbo 400 trans. at times when it happens i try to mash on it and it lacks power and sputters. 91 350 tbi runs like crap under load it idles fine and revs in idle fine but when you drive it or brake torque it, it kinda missfires putts and when you let off the gas it dies. 1 unplugging the batteries for about 10 min and then removing the butterfly in the intake. It's 2003 Chevy Trailblazer. Manifold heat was so hot it would cause failure of the number 7 spark plug boot. with it on ported vacuum when you give it gas it will advance by mechanical and vacuum advance. hello all,i have a 1994 chevy 6. My 1986 Silverado C10 with a small block 305 is having a weird misfire issue. A few days later it began to stumble and hesitate upon acceleration. Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly If your car or truck is equipped with a Holley four barrel carburetor and stumbles upon acceleration, more than likely the carburetor needs an adjustment to the accelerator pump assembly. 6 liter V6 engine (production code LFX) is a six-cylinder engine produced by General Motors for use in a broad range of vehicles. Enrichment System When an engine is under a heavy load, a richer air/fuel ratio is needed to produce maximum power, so most carburetors have some sort of enrichment system. Just guessing here, but there is a butterfly in the intake that opens and closes depending on the EGR ratio. it stumbles then back. I have a 1971 Chevy C/20 Custom Deluxe 4WD with one big problem; it bogs down and pops a lot through the carb when under a load of going uphill. Took the batteries out and trickle charging them - will take to O'Reilly's for load testing and then should be worry freeeeeeee. At idle it has a slight miss, and under load any sort of load or while accelerating through mid range RPMs, it runs like absolute crap and will even feel like a shutter at times. If the power valve is too big, it may cause the A/F ratio to run too rich when the engine is under load. The 2001 Dodge Ram 1500 has 21 problems reported for rpm fluctuates, shifts out of gear. I timed it the same day, but my hesitation is still there most of the times after the car warms up. What octane of gasoline should I use in a motorhome with a Chevy 350 engine in it? I just bought a motorhome with a Chevy 350 in it. The coil assemblies of Mercury outboards (which are often referred to as "the stator") are somewhat infamous for being the source of. Possibly damaged by a backfire condition. If the engine has a manifold vacuum of 12” Hg or less, a good way to determine power valve size is take the manifold vacuum at idle and divide that number by two. with the engine not running gently stick a pocket screwdriver down the bowl vent [the tube that sticks up center of the car just behind the primary choke housing just ahead of the air cleaner stud] holding the screw driver sideways angle blade toward the front of the hole you should feel a spring action when pushing down. RV with Chevy 454 engine problems: Mark: 9-9-09 : I have a 1986 El Dorado motor home with a chevy 454. Finally figured. The next step is a road test using a wideband oxygen sensor to check the cruise speed air/fuel mixture-main jetting, followed by a check of the power air/fuel mixture under load. Restoring a Holiday Rambler 1988 coach with 454 V8 in P30 chassis. Originally the port side motor was bogging under load but sounded ok in netrual. 7 vortec that has been having a problem for about 6 months now. Service, parts, cost & recommendations from YourMechanic. Looking at buying a Chevy Silverado or GMC Sierra? You may be in for a turbulent ride. For some scan tools enter VIN 10th "L" 3rd "C" 8th "K". Wiki User 04/07/2009. A misfire under load complaint can usually be broken down into 2 categories. Today though it started missing under load. Chevy V8 Misfire Caused by Excessive Cam Retard. This one has left me scratching my head, I have a 1995 Chevy K1500 with a 5. Lots of folks lately with Holley issues. com FREE DELIVERY possible on eligible purchases. Damaged or worn main bearing noise is revealed by dull thuds or knocks which happen on every engine revolution. So the trick to diagnosing an intermittent stalling problem is to catch the vehicle when it's acting up — and that rarely happens when you have the vehicle in your shop. You certainly can't go by the factory specs when your engine isn't all bone stock and isn't running all factory components, especially when running an aftermarket distributor, or even a stock replacement distributor. The distributor may develop internal faults. If you have a large cam in this motor maybe try leaning out the idle AFR target as the engine may load up slightly on take off. Stumbling seems to be fixed, but now idles rough intermittently. 3 4x4 etc I have a problem that is driving me nuts trying to figure out. An engine that hesitates, stumbles or misfires when accelerating or when it is under load, is an engine that is either sucking too much air, not getting enough fuel, or misfiring. I have a s-10 2. Had intermittent stumbling and backfiring thru exhaust when under load. When I first blocked my EGR on my truck I had this terrible jerking / surging that was cured by 2 things. With and Without Misfire Codes. Now in any gear I can give it up to 1/4 throttle and it is fine anything more and it makes a choking noise and doesn't do shit, it makes it hell when geting on the. 5L I4 engine with around 185,000 miles on it. There are two types of fuel pressure test: one which tests an instant of pressure, and a more sustained test. 7 liter vortecs. · There is increased load on the engine (such as what would occur if the automatic transmission was shifted into gear) · The IAC valve itself is faulty. A mechanic has to conduct comprehensive tests to find the cause of the stumbling and to ascertain that the engine is not backfiring or missing. i cant get a hold of the guy who owned it before me so i cant ask him about the bike but he did say it had a big bore kit. If while braking and giving it more gas and it gets worse your are dropping cylinder because it is under a higher load and can't fire the cylinder because either it is to rich or lean or you have a week ignition spark. 4 million messages and roughly 500 posts daily. This Chevy 1 Ton Van came in for an intermittent misfire complaint. If the Check Engine Light comes on, you may find any of the following codes: P0171, P0174 Lean fuel condition codes; P0120 to P0124 Throttle position sensor codes. Vehicle user interface is a product of Apple and its terms and privacy statements apply. For some scan tools enter VIN 10th "L" 3rd "C" 8th "K". It pops through carb when giving it more throttle this is my problem timing checks out, firing order is good,new cap and rotor plus wires plus compression is good this engine has 2 vacumn lines and both are new. >In fact they were >building some of the Corvette engines for GM. There are a few different causes between gas and diesel engines. could **NOT** run 500 hrs, under load, at max rated rpm. This one has left me scratching my head, I have a 1995 Chevy K1500 with a 5. The 2001 Dodge Ram 1500 has 21 problems reported for rpm fluctuates, shifts out of gear. member, and a note from Robert Knight, of Ohio fame, concerning the operation of their cars under certain driving conditions. I pretty well checked everything I found for ideas searching this topic. pdf), Text File (. For example, does the engine only ping at light load or throughout the rpm range? Is the hesitation more pronounced just off idle, or can it be felt when the throttle is moved even at a low road speed?. While a half-ton, like a Ford F-150, Ram 1500 or Chevy Silverado 1500, is enough to pull a fifth wheel, most people who spring for a trailer big enough to warrant a bed-mounted hitch will likely. some carburetors use a. It is part of GM’s third-generation high-feature V6 engine. Fuel pressure checks out, 11. 3 V8, Chevrolet, Cadillac, Buick, and GMC, 8 replies Lincoln Mark VIII hesitation, Ford and Lincoln, 8 replies Where can I find info on the 1988-1998 Chevy pickup truck V8 engines?, Automotive, 2 replies Fuel mileage Chevy pickup, Automotive, 4 replies. There is actually a bulletin in Alldata. 94 Chevy Truck surges at idle in gear, loss of power under accel? I just bought a 1994 K2500 w/ 5. Wiki User 04/07/2009. 3 Hesitation under normal conditions (Page EF & EC 79 in the manual) NEW Again, spark plugs, and PCV leaks and exhaust gas sensors, also referred to as oxygen sensors, are possible suspects here. with no load, but the engine stumbles and. Being able to "drive through" a problem can help in locating the root cause. They know their way under GM hoods because GM Factory Diagnostics puts data directly from your vehicle right at their fingertips. sooooooo easy to work on. If while braking and giving it more gas and it gets worse your are dropping cylinder because it is under a higher load and can't fire the cylinder because either it is to rich or lean or you have a week ignition spark. The previous owner told us that there was a small problem, it would "pop back through the carb" under load. when i drive around town. It does it sometimes at idle when cold and does it just going down the road at 40-45mph when it gets into overdrive and is running in the 1500RPM range. Had intermittent stumbling and backfiring thru exhaust when under load. 1995 Silverado, 2wd Air, 5. Well, now it works perfect!. In diagnosing the misfire, some information is needed about the maintenance of the vehicle. 6L V6 engine. The engine runs fine when cold but as it warms up it starts to "surge" at idle and when you come to a stop it acts like it wants to stall then it grabs. com FREE DELIVERY possible on eligible purchases. Afterwards it ran like a champ. Look at the Atilla build sheet for the ~400 hp 350 and mimic everything as close as you can. One of the most common symptoms of a failing TPS would be a tip-in hesitation or stumble when you apply throttle to take off from a stop. Armada Master @ Feb 5 2012, 10:46 AM wrote: 40 PSI 'sounds' about right to me, but I do not have a FSM. The part was covered under my 5 year warranty - just had to pay for labor. 8L was offered in the 1975 model year Skyhawk, Apollo, Century and Regal. txt) or read book online for free. My son used to have a 90 Camero with a 350-tbi. he'll be familiar with chevy small. 7 vortec bogs under load repair. You may notice a bit of a "lean hole" around 5" of vacuum with a 1406. he'll be familiar with chevy small. Service, parts, cost & recommendations from YourMechanic. Is the cross member under the load on a 1989 Chevy van? Yes, the cross member is under the load on a 1989. Hi, I am posting this for a friend. Just to name a few, the Chevrolet Camaro Sport Coupe and all the sport-utility vehicles like the Tahoe, Suburban and Blazer. In Park or Neutral it idles perfect and at WOT it revs up perfect. Yet under load, the engine could bog, backfire, and run like poo. They seem to occur for no apparent reason. Hello group. Now I can pull a skiier for about. It idles smooth, and revs up in park. Just changed oil for the third time and rotated the tires. checked all fuses, all ok, lights at guages on. International Full Size Jeep Association > Tire Kickin' > General FSJ Tech > installed edelbrock 1406, dies under load. Like 1 minute it was fine, I stopped at a buddies house for 2 hours, then this started. 7 Idle surging,stalling in the alt. Certain ECU’s allow for more or less tuning of this parameter. That's a long story from when my project began. mine wouldnt burnout till i got the timing dead on!!!!. Chevy Silverado and GMC Sierra Gasoline Engine Problems there is a intermitten miss or skip in the engine under load 30-65 mph, no codes on scan, o2 sensors. The problem I am having is the truck is missing under a load. Now in any gear I can give it up to 1/4 throttle and it is fine anything more and it makes a choking noise and doesn't do shit, it makes it hell when geting on the. The WOT air/fuel ratio was only slightly rich at 12. Chevy 350 block checked over, machined and set up for Marine crank, mild cam, stainless valves, roller rockers, rollered timing set, brand new cylinder heads etc etc. MAP sensor go BAD all of the time but sometimes some other condition (affecting engine performance) fools the PCM (Powertrain Control Module = Fuel Injection Computer) into thinking that the MAP sensor has failed. 7 liter vortecs. It's just a matter of shimming your caliper out, that’s all, and would take about 30 minutes to repair. SYMPTOMS OF INCORRECT IGNITION TIMING Symptoms of incorrect ignition timing are poor fuel economy, sluggish acceleration, hard starting, backfiring, or "pinging" or "spark knock". The blower Mighty and Race Demon carburetors have power valves with vacuum tubes that allow the power valves to be boost referenced, just connect this port to boost pressure and the power valve can see engine load or vacuum instead of the vacuum created by the supercharger. Restoring a Holiday Rambler 1988 coach with 454 V8 in P30 chassis. Chevy EFI Blue Monsoon engine. One of the most common symptoms of a failing TPS would be a tip-in hesitation or stumble when you apply throttle to take off from a stop. Chevy 350 (comp cams Thumper) Holley brawler 650 (mech sec) tring to set idle under load (sits at 800-900 RPM) but in park races up to 1400-1600 RPM. The issue that my truck had ended up being 3 ignition coils that under load failed. So if torque is what you're after, "there. What could be causing this extra load on the engine? What could it be in the compressor that is so much resistance?. An easy way to check Q-jet metering rods. Lets deal with with this test first. The latter can often solve stumble and stall problems that occur at highway speeds or under acceleration. Problem CONDITION POSSIBLE CAUSE CORRECTION 3) Ford& Holley Only. But you also need compression and the correct spark timing. My boat isn't heavy, probably 4k loaded, but i need to replace this truck and/or motor if it can't get this job done. Replaced the engine and it starts and runs fine, until you drive it under load. Two of them switched to a single plane and solved the problem. he can be found under the hood of his. Galxrha, Mar 1, 2019. I personally think it is bad gas ie,water in gas & iam assuming that the 83 oct, is a type-o. I cant win! What am I doing wrong?. Read about Carburetor tuning tips including power valves and centrifugal blowers, only at Chevy High Performance Magazine. > FREE expert answers to automotive questions. SHARAPOVA OUT. Learn about this problem, why it occurs, and how to fix it. Apparently both the vac unit and dist model did not match the motor/cam config which WAS causing this stumble at cruise. it stumbles then back. 7 tbi runs rough cold and Discussion in 'Chevy Trucks I checked under the truck to see if the fuel filter looked new or not and it was kinda old. I pretty well checked everything I found for ideas searching this topic. This will provide idling and proper fuel flow under wide-open throttle conditions when manifold vacuums seldom rise above 1” Hg. I have a 305 that has been running fine for many miles. Not a miss and no backfires. Re: 1995 Mercruiser GM 350 V8 engine stumbles and falters under load. Gen I & II Chevy V8 Tech Board ; I ending up jetting my 4150 750 cfm carb on a 350 with a rpm intake to 69's up front and 76's in the back. Excessive crankshaft end play is indicated by an intermittent rap or knock sharper than a worn main bearing. the two you have a blow fuse interior the fuse field or the custer substitute into undesirable. could **NOT** run 500 hrs, under load, at max rated rpm. After storing regular (87 octane) ethanol gas for 5 months with 1/2 the recommended StabilI put 5 gals. Then about two weeks later, it starts acting all wierd like it starved of fuel or something. The bus was experiencing some sputtering when the bus was under a load like accelerating through the gears from a complete stop or driving uphill. 2000 GM sierra, 5. higher the rpm and the more throttle into it the harsher the misfire. Under load only above 4000? If you are hitting a stumble when opening the secondaries and then it cleans up. went to leave work 4hours later and instantly noticed a misfire under load above 1500 rpm. 7L 4BBL 350 V8. What causes a 350 Chevy engine to backfire under load? Answer. It should NOT open unless the engine is under load. Lack of power when you accelerate the vehicle down the road. either way. 1990 chevy c1500 hesitation and stumbling during acceleration. I've always been told TBI motors are picky with timing that if it's not perfect it won't run right. 7 vortec bogs under load repair. To learn more, see. Engine hesitation, almost by definition, usually goes back to a misfire in one or more of the cylinders. I have a 355 Chevy in a 86 Monte Carlo. Incoming search terms: Car Lunges At 60 Mph,Troubleshoot Chevy 1996 5 7 Hesitation,Why Does My 2005 Buick Hesatate When I Am Driving At 40 To 55 Mph,Van Low Acceleration And Will Not Go Past 60 Mph,2014-18 Gmc Sierra Transmission Shudder Around 20 To 25 Mph,What Would Cause Very Bad Fuel Mileage And Misfire In 2012 Ram 1500 5 7 Hemi,Wining. GM doesn't use it anymore (too expensive). Chevy 350 (comp cams Thumper) Holley brawler 650 (mech sec) tring to set idle under load (sits at 800-900 RPM) but in park races up to 1400-1600 RPM. with no load, but the engine stumbles and. Engine stalls under load. Once the brake is released the car runs good, it doesn't have much power and I have to take off slow or it will load up and run bad. 5 turbo and having a fuel problem i think. This seemed to work fairly well in cool weather, but as soon as it started warming up, I started having problems. You may notice a bit of a "lean hole" around 5" of vacuum with a 1406. The problem often means the air/fuel mixture is not being properly enriched or is going lean, or the ignition system is weak and is misfiring when the engine comes under load or the air/fuel mixture goes lean. Firing order double checked. Chevy 350 problems. It should NOT open unless the engine is under load. Now I can pull a skiier for about. The "sharp" misfire, on the other hand, frequently relates to ignition problems. when i drive around town. The misfire would come and go and has been getting worse. of fresh 87 oct. EPA estimated with 3. Interestingly, unlike other Chevy small block designs, the Gen II engine was never available in any trucks manufactured by GM. 26 seed Flavia Pennetta of Italy knocked off the 2006 champion 6-3, 3-6, 6-4 in the third round to hand Sharapova her first loss in 13 three-set matches this year. Chevrolet Infotainment System functionality varies by model. It runs great with the new wires and stuff, but still chugs and sputters when I accelerate or under load!. Power valve blown out by spitback up through carb. Originally the port side motor was bogging under load but sounded ok in netrual. first the basics. During a road test you are able to read and then correct the air/fuel mixture so you can have them correct at idle, cruise/light throttle and full power. You may notice a bit of a "lean hole" around 5" of vacuum with a 1406. I have a 305 that has been running fine for many miles. Voyage across any lake or pond in the most majestic ocean liner – the RMS Titanic R/C boat. Home; web; books; video; audio; software; images; Toggle navigation. I put a 400 hp system on my 69 camaro 350 with an edelbrock performance kit (heads, cam, intake). I am trying to tune out a hesitation in the off idle part throttle range. I bought a jet kit for this because there is a stumble when I stomp on it. My truck randomly stalled on me about a week ago. I am using an Innovate LM2 to help tune, everything is fine @ idle, under load, and WOT. What octane of gasoline should I use in a motorhome with a Chevy 350 engine in it? I just bought a motorhome with a Chevy 350 in it. It is a 91 chevy truck with the 350 (5. Spark comes from the ignition system. 1993 Honda Civic - stumbles under load [ 4 Answers ] I have a 1993 Civic 5 speed with a D15B7 (NON v-tec) motor with 95,000 miles on it The car is operated in a relatively cool area (Vancouver, B. Once the brake is released the car runs good, it doesn't have much power and I have to take off slow or it will load up and run bad. 041 64cc 202/160 heads. Chevy 350 (comp cams Thumper) Holley brawler 650 (mech sec) tring to set idle under load (sits at 800-900 RPM) but in park races up to 1400-1600 RPM. Why does my steering wheel shake while braking? July 8, 2017 Joe Free There are many front-end problems that could cause your steering wheel to shake while braking and traveling at certain speeds, but they will typically fall within a few categories:. Nothing fancy, except for the muffler, which will be getting a OEM replacement soon. chevy forum at Car Dealer Forums; Symptoms are as follows: When first started it runs fine for a few seconds then. A year worth of head scratching. Turns out my engine is a 68-70 model as far as cam is concerned and has a HC (high compression) head on it. Only difference is company and some minor stuff Edelbrock intake, dynomax headers into a pypes system. I think it was a 2 valve pushrod, but I could be wrong. The compact, simple design lends itself well to a wide number of applications, because it fits just about anywhere a standard distributor fits and has all of its electronics – the distributor, coil, and control module – integrated into a single unit, requiring no additional wiring or components, while upgrading each of those components to modern, performance-oriented pieces. Restoring a Holiday Rambler 1988 coach with 454 V8 in P30 chassis. 3 4x4 etc I have a problem that is driving me nuts trying to figure out. My truck randomly stalled on me about a week ago. Interestingly, unlike other Chevy small block designs, the Gen II engine was never available in any trucks manufactured by GM. Learn what does P0300 Chevrolet Cylinder Misfire Detected Random Cylinders means, location and how to repair?. so I put a stock pipe back on it. 7 tbi runs rough cold and Discussion in 'Chevy Trucks I checked under the truck to see if the fuel filter looked new or not and it was kinda old. You need to check the vehicle for an air leak, (maybe a vacuum hose come off), oxygen sensor on bank 2 not working, or a knock sensor having failed. chevy forum at Car Dealer Forums; Symptoms are as follows: When first started it runs fine for a few seconds then. My question is at what setting on the accelerator pump setting is too much? I am now ant 75% and still have a tiny bit of stumble. 7Liter engine with 160,000 miles. Why is there Misfiring on load 1987 Chevy truck 350? Answer. I have torn this thing down 4 times now but get the same result. If you have access to a scan tool use a hook up for a 1990 350 cu. My truck bogs down (and tries to die) when I give it gas to accelerate off of a stop. You need to hook the dist to ported vacuum, also time it with the dist vacuum hose unhooked and port on carb blocked temporarily. The first Buick 3. Like 1 minute it was fine, I stopped at a buddies house for 2 hours, then this started. But, would a fuel problem present itself when put into gear and not while in neutral. Just climbing through gears revs to 6500 no problem but under load it stumbles. My boat isn't heavy, probably 4k loaded, but i need to replace this truck and/or motor if it can't get this job done. That's a long story from when my project began. replaced computer and coil and checked the timing and still same issue. Engine's are inefficient when cold and will require a lot more fuel, so that may be what's masking the symptoms until warm.