Originally Posted by
Naturally_Aspirated_Boost
swap the ECM or flash the ECM from the park avenue with the file from the Fbody.
Still failure?
Swap the ICM with a junk yard ICM, Replace with new ICM if found faulty. Use AcDelco's ICM. More $$ but longer life.
Still failure? Check to make sure your Fuel pressure is 45LBs on idle, 49-55 On WOT.
My issue, was the ICM, Backfiring, bucking, stalling and over all poor performance, was solved with a new ICM and a Fuel line repair (Fuel filter connection was leaking, allowing air into the fuel system)