Car stumbles, dies upon acceleration

[greekguy7]

I have an '88 Pontiac Grand Prix with a 2.8litre V6 and auto trans. The car starts well, idles ok and runs ok when cold. Once it warms up and I try to accelerate normally from say 20MPH to 30MPH the car would stumlbe badly to the point that if I dont let off the accelerator it will stall out and die. It will restart immediately though. If I immediately let off the gas, it will keep running.

 

I replaced the TPS sensor and adjusted it for .55V at idle, and did idle relearn a couple times. The plugs, wires, filters, etc. have been changed in the last 10k miles. No codes either. The car has not been driven regularly for the past year partly cause it would do this sometimes, and partly cause it would die at idle in the past sometimes. The gas is new as I have been trying to get it to run right for the past few weeks. Any ideas or suggestions?? THANKS!!

[SigEpCutlass]

Have you checked the fuel filter? It may be clogged...

[greekguy7]

The fuel filter has less thna 10k miles on it but of course its possible. I will try to check the fuel pressure with a gauge. The car hasnt been driven regularly for a year and a half so perhaps the injestors are clogged too?

[SigEpCutlass]

That is very possible. Have you run any sort of fuel system cleaner after it sat for a while?

[5speedz34]

Do a FULL tune-up to the car. Plugs, wires, ICM, Coils, trans fluid/filter, fuel filter, PCV. And then if the problem persists post back.

[jpfish]

i kind of had a problem like that before too... not sure what fixed it though, i dont remebmber. It was either a water like into my ECM, which was replaced. Or it was simply cleaning the remote power terminal near the underhood fuse box, but i have the 3.4L engine. What ever it is i hope u get it fixed. good luck.

 

-jon p