okay i gotta 92 firebird w/ a V6 MPInjection, and the problem im running into is that it idles fine, but when i drive it and put a load on it like if im trying to go up a hill it bogs out and sometimes back fires and looses alot of power, i have changed the following parts,

Cap/Rotor/Plugs/Wires/O2 Sensor.

I did a fuel pressure test which seems to be normal, some have suggested a plugged cat. any ideas? im trying to get this up and running so i can use it as my daily driver and my 70 camaro as my weekend car, and besides if it sits to long the city wants to tow it.

 

Sounds like the timing is off. Have you checked the base timing (bypass connector disconnected)? The timing @ idle with the bypass connector connected?