hey everyone, im racking my brain with this car i just bought. its a 91 formula firebird 305 tpi 5 spd. it runs good cold can rev it right up but the warmer it gets the worse it gets, can barley move out of its own way. things that have been replaced are. plugs, wires distributor cap and rotor, AIC, MAP sensor, computer, i dont even know the rest the guy i got it off of replaced all those things already, those are the first things that came to my mind. like its so bad now it wont rev past 2500 rpm. i was thinkin ignition control module under the cap or even the distributor itself. can somebody please give me suggestions, or maybe you've dealt with the same problem. thanks in advance, steve

 

could it be a blocked cat in the exhaust?

 

nah there both gutted. im sure its either the coil or secondary under the cap or distributor itself