Engine stalls when stepping on gas pedal and will not idle on its own.
First off, the engine takes a lot of tries to get it started, then when it does fire up, it sputters a lot at the lower RPM range, then once I put my foot on the gas to bring the revs up, it will go up for a second, then fall until it stalls out. If I try to keep the revs at a constant rate, it will stay steady for a few seconds, then fall and stall out.
I have replaced pretty much everything (fuel pump, fuel filter, plugs, wires, gas cap, fuel injectors, MAP sensor, oil & filter, fuel pressure regulator)
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Q; Is your service engine lamp on? This vehical has a power steering pressure switch,witch helps your engine maintane idle at parking lot monuvers. its next to your power steering pump.you can check if it works by starting your engine and let it warm up. then without tuching your gas pedal turn your steering wheel slowly , the engine should maintane its idle. if this works and your service eng. soon is not on then try cleaning your throttle plate. A dirty throttle is alot of stalling causes with all vehicals.
I have seen this type of problem before, this sounds like the engine is not getting the correct amount of fuel pressure it needs as you accel.the first thing is to remove the fuel filter and replace it, take the old filter and blow into it, this will tell you if its restricked. the next step will be to check fuel pressure, you will need a gauge for this test, hook up gauge at valve on the injector rail, take caution wear safty glasses as fuel is under pressure and will spary out a little as you connect line for the gauge to fuel injector rail valve, you will run the engine and also step on gas pedal as you watch the pressure, i would rev the engine to around 3000rpms and hold it to see if engine tries to stall or buck when it begins to act up look at the gauge and if the pressure drops as it starts to act up then the fuelpump is bad. its not able to keep up the pressure. start there good day.
Have the idle bypass valve checked, also called idle air control valve.
If that valve is stuck in the closed position, it's not allowing the fuel to bypass the throttle plate to keep it idling, resulting in stalling, but will keep engine running if the pedal is pushed down.
Try depressing slightly the gas pedal to see if the engine continues to run when you put it in gear. Might have to depredd gas pedal and brake simultaniusly. if the engine continues to run, then the problem is in the idle circuit. Try decarboning the throttle body and the idle speed control.
Try pulling the engine coolant temp sensor, They often crack not sure
why but the ceramic tip cracks makes the car hard to start, the car's
idle may race while shifting gears, and often smokes. The sensor is on
the right side of the engine when looking at it on the head. Easy to
change and get too
Is the check engine light on?? If not, I would try base idle adjustment. For that you will have to go to a dealer, because you need a scanner for this operation. Base idle adjustment is done by turning a screw built into the IAC valve, which keeps the car running by giving it air. If your base idle is too low, then the engine is not getting enough air resulting in stalling. Let me know what you find.