Possible PCM failure?

i have a 95 xlt I've been fightn sever probleems with for a few weeks now so basicly it started w/ the truck would run for an hr or two then it would to set for a few hrs cause no start its got fuel pressure i noticed if i unpluggd the mass air flow sensor it would run better so i checkd the voltage it was no good replaced it starts a whole lot better but runs worse haha now it starts idles out fine but as soon as it runs for a few moments it has an incosistent idle it chokes to 500 pm an then the engine forces it self back up to 2000 rpm an fluxates back an forth ive replaced plugs, wires checkd for vacum leak cant find one noticed the thermostat has a lil leak from it not really sure if that could cause it as well has new fuel pump & filter an the mind boggling partis occasionally when the motor starts to choke the check engine light kicks on it throws no codes ?? but thanx in advance !!!:banghead: :banghead: :banghead: