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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!!

try the map sensor thats should be located by your firewall, i had one of those cars that did the same and thats what i had to replace, then it ran fine. see if you can pick one from a boneyard first so you dont spend all kinds of money.

You smell heavy fuel when that happens?  *Could* be fuel regulator.