93 3.1 Intermitantly runs rough

Greetings All!. my 93 3.1 runs like a top when first started up
but after it warms up some it starts stumbling and looses 90% of it's power I've replaced the fuel filter, sparkplugs and wires,air filter,PCV Valve And the O2 sensor. still geting worse. also wile it's running like that it seems to be getting hot(temp light not comming on) the coil pack assy. is only a year old as well. Some times it will snap out of it and run like a race car :)
Any help is greatly appreciated Thanx ChrisInBoise

This is my stock answer, but did you replace the ignition module too, or just the coil packs?

Yessir I did

Are you familiar with the MAF sensor? It is in the duct from airbox to engine. Air flows through it, and it meters fuel according to the reading it gets. When they go bad, you can let the engine warm to operating temp, then tap on the outside of the sensor, prefeably with a plastic handle of a tool or a rubber mallet, if the motor starts to misfire, or even die, reacting in any way to jarring the sensor, it must be replaced, there is an internal open circuit. I'd start there, if you haven't already. Let me know.

check your fuel pressure. it should be 31-35psi, and a fuel pressure regulator will act up intermittently. pinch the return line and the pressure should shoot up. that would indicate the regulator is bad. if the pressure is low and the pinch test doesn't make the pressure rise, you have a bad fuel pump

Greetings 'Hey guy's thanks for all the help with my car
I FOUND THE ISSUE!!! The No.3 Coil Pack Spade Connector
was arcing and ate away the spade causing the intermittant problem
It's All Good now Thanx again, Chris