Question about Chevrolet 1500

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Truck accelerates sluggishly, then at cruising speed of 40 mph it surges. I pulled no. 2 cylinder spark plug and it was fouled. It does burn oil. When I accelerate to passing gear it blows out black smoke. What may be the problem? Help!!

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  • 61 Answers

Over loading,,ck temp sencers to see if they are reading correctly, if temp sencers are reading cold after truck has warmed up,there telling the ecm to richen the fuel,,

Posted on Dec 13, 2009

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Posted on Jan 02, 2017

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Idles fine, but at 35 mph and above why won't it hold speed?


That should still be under a warranty!

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Once I reach wanted cruising speed of 35 mph or above (and the car ... At that point I keep pressing pedal slowly but car does not accelerate or needs eternity to speed ...Fuel pressure within specs (40 psi in idle) and fuel pressure regulator holds ... "The 3100 V-6 engine is mated to a 4T60E four-speed automatic overdrive ...

Sep 27, 2015 | Cars & Trucks

1 Answer

1996 Sonoma Problem


Not sure. You need to do a little checking of ignition and fuel delivery. I would first check for spark at all four cylinders to eliminate or verify if ignition is causing it. If you have distributorless ignition, you have 2 coils. One coil serves cylinder 1 and 4, the other coil serves cylinders 2 and 3. If for instance, you have weak or no spark on 1 and 4, suspect the coil for them.
If you have good spark on all four, a bright blue, snapping spark, then pull the spark plugs to check they are not fouled, like oil fouled that prevents spark..
If ignition is good, look to the fuel system.
Maybe an injector is blocked open by debris and won't close. That's very rare, but a possibility. The spark plug for that cylinder would likely be much wetter than the other plugs after cranking it over. Maybe the fuel pressure regulator has failed. If you can find the fpr on top of engine (some are located under the intake manifold, hard to get to. and some are fitted to the pump in the gas tank-impossible to inspect) then pull off the vacuum line to it and check for evidence of gas there-a sure sign of a ruptured regulator, and it will let extra gas get sucked into the engine-just like your problem. If you can't find the pressure regulator, you should have the fuel pressure tested-mainly to see if it is too high-also a pressure regulator problem,. likely.
IDK, maybe this will help you a little, good luck.

Dec 20, 2012 | 1996 GMC Sonoma

1 Answer

I have a 2003 Nissan Morano


your burning oil the plugs probably need replacement ---and the oil can cause fluctuation in rpms ---carbon valves --problems with o2 sensors --clog cat converter-foul plugs etc

Apr 24, 2017 | 2009 Nissan Murano

1 Answer

1997 Oldsmobile Achieva - check engine light is on and car is running sluggishly...brand new motor installed 6 weeks ago.


What speed are you going when it chugs?
It could be as simple as a bad spark plug or a spark plug wire/boot grounding out.
When spark plug boots get old, the rubber cracks and lets voltage arc out the side and to the engine instead of through the plug.
This will be most noticeable when trying to maintain a speed of over 40 mph, or under mild acceleration.
The reason for being noticeable at this speed/acceleration level is that the transmission torque converter will be locked, transferring the vibration from any engine miss straight through to the wheels.

Jan 07, 2012 | 1997 Oldsmobile Achieva

3 Answers

Just picked up a truck 2000 s-10 everything checks out with this truck except for at about 40-50 mph hour it feels like its being held back sometimes. it just very sight enough for you to notice jerks...


The oil pressure is supposed to increase when accelerating and come back down when idling. Try replacing the fuel filter and see what happens but the oil pressure has nothing to do with it.

Jan 07, 2011 | Chevrolet S 10 Cars & Trucks

1 Answer

Truck 2005 ford Ranger 3.0 liter 6cyl. starts to cut out severely above 40 mph oan when depressing accelerator Does this sound like a bad fuel filter because when my fuel pump went bad it would idle rough...


fuel starvation from somewhere? filters,, sometimes two filters one by the tank and another under bonnet, dont think its plugs, but you can remove and use small wire brush to clean them. check the plug electrode colour to see fuel burn pattern on cylinders, should be lite brown deposits on electrodes, white electrodes = overheating and black sooty electrodes = to rich fuel mixture.

Jan 11, 2018 | 2005 Ford Ranger

1 Answer

Speedometer surging. actual speed 40 mph,


Its a loose connection on the speedo cable. its a b*tch to get to. I had the same problem on my truck, it would fluctuate in 5th gear on the highway. i spent the money and had a professional do it.

Aug 09, 2009 | 1990 Cadillac Allante

2 Answers

Boggs or runs rough during acceleration


sounds like you need a tune up or a coil is bad

Jun 11, 2009 | 2000 Ford F150 Flareside SuperCab

1 Answer

I have a 1988 Chevy C3500 1 ton PU. Engine runs great at idle and acceleration but when cruising it runs rough or surges.


if the truck has a locking converter goin bad it will surge at steady speeds such as 55 mph the converter will lock and unlock causing you to feel an surging

Mar 07, 2009 | 1988 Chevrolet C3500

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