1994 Chev Corsica Stalling - Engine

Question: Okay, maybe all you chevy experts can get this one. New wife's 6 cyl/auto corsica has this hesitation/stalling problem thruout rpm range. Always happens when throttle (gas pedal, NO CC) is stationary at whatever speed we are driving, and even a VERY minor movement pushing down or letting off the pedal solves the problem. Of course, when coasting to a stop, you can't rev the engine so it dies. At speed when it happens, if pedal is not moved within 15-20 sec's, the engine will die. Repeatedly, this may go on for hours or only minutes, or only once. Temperature ranges from Baltimore blizzards to Yuma summers, and right after cold start to second tank of a cross country trek. The only constant is it seems to happen more often after left hand turns, in fact is almost guaranteed after turn in to our housing area. Engine light is not total predictor of problem, as it comes and goes whether stalling or not. EGR, plugs and wires, and the other normal things, plus a few other things have been replaced per various codes over the last 3 years at various shops on east coast, and problem returns almost immediately, with a different code. I recently blew out the vapor canistor and return lines and have been leaving the fuel cap vented, and this seems to lessen the problem. I originally thought it might be a clogged in-tank fuel filter, but with additives and varying tank levels, there has been no change. My thoughts now are the TPS, but I am a ford guy, and don't have that much experience with OBD. Any takers Rick Yuma, AZ

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Technican: You seem to have been through the gammit with this car. Before you replace the TPS check the throttle body for carbon build up around the throttle plate. It can lead to the problem you are describing with the stalling. The carbon buildup keeps the throttle plate open and in a different position than what the TPS is registering to the computer.It tends to confuse this not to smart to begin with computer and then the stalling starts. It can happen at any time and after any amount of time ... May not do it for a couple days then just happen. Also have you had the O2 sensors replaced? A clogged fuel pump filter screen would also create a run rich condition as the computer tries to over compensate but that tends to be an all the time thing. Most fuel additives attack any water that might be in your fuel system with enough mild detergents to possibly unclog your injectors but would not be sufficient to unclog the fuel pump screen. If I can be of any further assistance you can contact me at upon acceptance of this answer. ASE Master Tech

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