hey whats up guys im a new guy on here but i have a big 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??????

 

Have you checked the knock sensor? After the engine is warmed up, it will switch open/closed loop and start taking input from the knock sensor. If there are issues from it, that can cause the system to adjust for the knock.

 

all sensors were new lol fixed the prob today.... i got a free set of LT-1 injectors for free replaced my old ones she will not spin the tires from a 20mph roll start thanks for all the help guys