Ok this is non muscle car related. Working on my buddys car 94 sunbird Not by first choice, car died in front of MY house so i have to get it going for him so it can leave.

Symptoms:
Hard cold starting or even after its been started and left for 10 minutes or so. Once car starts (cold) it runs fine, then after about 5 minutes it developes a low end miss. If you try to rev it fast it wants to stall. Once car has been good and warmed up, its undriveable, but problems dont come into effect until its warmed up. No codes are up. Im kinda stumped and I dont wanna keep throwing parts at it, cuz it a P O S and my buddy has hardly ne money as it is.

Things Changed (so far)
Plugs, wires,air filter, fuel filter, throttle position sensor,

 

what engine?

quad 4? 3.1 v6?


sounds like a possible ignition module

 

its the 4 banger

 

have you looked at the intensity of the spark? sometimes the spark will get weak on older cars. its kinda hard to find due to the eng. still running, you'd think the coils are ok. make sure it has a bright spark. what about the map sensor? problem is, you/were just guessing. what is the fuel press.? low fuel press. can also have that exact problem. when its acting up, try spraying some gasoline into the throttle body. you'd need a spray bottle obviously for that. dont spray it onto the maf sensor though if it has one. oh yeah, if it has a maf, try unplugging it to see if it gets better.