2004 Chevrolet Cavalier Q&A
2004 Chevrolet Cavalier Question: P0300 code went away after change fuel filter, why is it still idling rough?
I had a P0300 multi misfire code, I changed the spark plugs, wire set, fuel filter, air filter and cleaned the throttle body and the code went away, but is still idling rough and stalling when I come to a stop sign. I checked the fuel pressure and that is running normal. I then checked the vacuum lines for leaks and found none. I am not sure where to turn next. - frustrated_owner83
You're missing something; Take it to a technician who does drivability diagnostics. Sounds like it's above your head, and something we deal with daily. Sounds like you still have a vacuum leak, but I can't say what single thing is causing your problem without testing it first. - ProfessorG
you may have an injectore issue or worse, seek a diag by a good mech in your area - globalhelper
What are you calling a wire set, the plug boots? Code went away?? - pushrod