Thread: 1998 Gd Prix sputters and stalls when engine warm

did you check your fuel pump relay? the real question is why does the fuel supply stop?-Is it some other sensor telling the pcm to cut it off or is it the pump and/or relay? Could also be MAF, IAC or others.......hopefully this gives you somewhat of a place to start.

You say the fuel pressure tests good and then stays constant while running, right? Ok, not a fuel supply issue.

Is the smoke coming out your tailpipe white and have you checked the coolant level lately? If not, please do so. Doubt it's your issue, let's get it out of the way though.