My 94 trans am has no power any more i have all the bolt ons and a six speed trany but it wont even spin the tires going from first to second. it also almost stalls when taking off now just recently I have replaced the plugs and wires the opti spark fuel filter and checked the fuel pressure at low rpm after it is moving it power drops off faster in higher rpm fuel pump is a possibility still any other ideas

 

Does it have a catalytic converter?, if so it could be clogged. O2 sensors or EGR valve maybe. I am fighting an almost identical problem, car wants to stall when taking off and has no power up top. Good luck to you and I will let you know if I get mine figured out.

 

it has gutted cats no egr and the pcm has been tuned for the headers it just started having problems with power when i replaced the opti and the water pump but it was missing so bad before it could have been having problems before the work

 

You could have burned a wire or two on the headers. It is also possible the new opti is going south. It is one of those hard things to believe, but it happened to me. Brand new GM opti died after about 2 weeks.