Question about 1991 Chevrolet C1500

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93 Chevy 2500...runs fine in neutral and when driving slow,but when u accelerate it falls on its face like its starving for fuel...both injectors are spraying good at idle...have checked everything, is there a sensor someplace that regulates fuel flow?

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It sounds like there's a vacuum leak. It's been a while since I've worked on those vehicles, but, I'm pretty sure there's a valve body on the transmission and should be vacuum controlled. When shifted out of neutral, it loads up the engine causing an increase in vacuum pressure. If there's a leak or stoppage or any sort of interruption, it could cause this issue. This does not sound like an engine or transmission problem. It sounds more like a system (vacuum system, valve body) issue. I wouldn't be too concerned with the condition of the engine or transmission themselves, more so the solenoids or lines attached to them. Start with the vacuum though.

Hopefully that helps get you started. Good luck

Posted on Mar 03, 2009

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I have an 1999 Infinity QX4 4WD. It started missing so I changed the plugs, plug wires, distributor cap, rotor, and fuel and air filters. It won't start. After it cools down it will start and run fine for...


There can be a misfire too from the cylinders.

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. 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
• P0222 to P0229 Throttle position sensor codes
• P0400 to P0409 EGR related codes

If there are no misfire codes, a common cause of acceleration stumble is a bad throttle position sensor (TPS). The TPS tells the computer how far the throttle is open. The computer uses this information to determine how much fuel is needed to maintain the correct air/fuel mixture and when extra fuel is needed if the throttle suddenly opens wide.

Another common cause is dirty fuel injectors. If varnish deposits have built up in the tips of the injectors, they won’t spray as much fuel as they normally do, or will “dribble” fuel instead of spraying a fine mist. This creates a lean fuel mixture and conditions that are ripe for stumble and hesitation (also misfire). Look at short term fuel trim (STFT) and long term fuel trim (LTFT) with your scantool. If the numbers are high, it tells you the engine is running lean and the injectors need cleaning. Treat mild cases with a high quality fuel-injector cleaner additive. Severe cases require professional cleaning equipment.

Also if this sensors apply to your vehicle, camshaft sensor or crankshaft sensor if sensors bad you don't get any spark. Also run a scan on the car.

Good luck and rate this solution, please.

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