This can be various things John.
I have replaced a couple PCM's in the past to cure this issue. I had the same issue with my car with the old wiring, and the pcm reflash cured it for about 6-8 months, then the pcm had to be replaced. It never did it after that. There were a few other 98-99 cars that I ran into this issue on, and one also needed a new PCM. It seemed to be a software problem; the computer was not compensating for the hot engine basically.
Camshaft sensor will cause this. Auto shutdown relay will cause this. Vapor lock will cause this (fuel boiling in hot fuel rail causing vapor lock-- computer reflash is supposed to compensate for that).
It sounds like your fuel pump is ok...possibly could have a leaky injector (which would dump gas into the intake after shut off, essentially semi-flooding that cylinder). I would see if you or your mechanic can replicate the problem, and at the time it is doing it then do the diagnostic tests, and hopefully something will come about at that point.
Last edited by Daytrepper; 08-05-2009 at 09:05 PM.