TransAm91GTA

hey whats up my name is Josh i live in elkridge md i own a 91 gta all black 350 tpi automatic i signed up on the jorums to find some help or idea's i posted this in the tpi section but no responce maybe somebody local has an idea or two here is my prob......... if i come out in the morning and start my car she runs great i can rev it still sounds great...... BUT.... once it warms up it seems to get a misfire and if you rev it and let off it backfires like crazy... but if you unhook the O2 sensor its seems to run better but i still get that misfire any idea's???? below are a list of this already replaced

plugs,wires,cap,rotor,new pick up,new module,new o2,new computer,new aic,new map,new tps,new cooling temp sensor,new fuel filter....

note i also waited for the misfire and unpluged each injector and they all made a diff some more then others... i was thinking bad injector but wouldnt it do it all the time?????

compression test was perfect across the bord so please any idea"s??????

TPImoneypit

iTrader: (5)

If all that stuff is new, then yeah it probably is a bad injector. My '91 did the same thing when I bought. But I made a mistake, and only replaced one, then another one went sour. So my advice to you, do all 8, not just one.

Mine also had a bad habit of running real strange right about 2k rpms, lots of rpm surge, does yours do this at all?

TransAm91GTA

omg yes!! like it revs up and down up and down and if you let it idle and then rev it up real fast wil rev perfect for like 2 seconds then start to run funny and the smell from the tail pipes are killing me lol

TransAm91GTA

thanks Goose for ur help man.....ok well great news the LT-1 injectors work GREAT!!!!!! no more misfire orrev up and down she is so much better on gas now and going down my street at about 20mph and i floor it she still spins wheels thanks for all of ur help guys