my 94 chevy has no low end power it has be slowly getting worse so i changed the tps,map, and did a tune up plugs wires cap roter fuel and air filter put a new fuel pump in checked the timeing many of times with the connecter disconnected and still no different so i did a compretion set about 140 psi an all cylinders so just to see i took the heads off and had them rebuilt put it back together and still the same. it has a 350 and is 4 wheel drive has a rebuilt 4l60e trany and has new exhaust from the manifolds back so it not a plugged cat the only thing i can think of is maybe pcm or distribiter please help
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