i got this car running on 4 cyls thought it was 2 coils turned out to be a bad ecu we put one in programed it and later found out it was a cali spec ecu so im lacking a 4th 02 sensor that my fed spec car never had im just lettin ya know this before i go on cause maybe its my problem but i doubt it.



anyways, all brand new oem coils, i ran it 3000 miles on irdium plugs it ran pretty good and every once in a while out of the blue it would miss on a cyl but not constantly just once every day if that. then days when it didn't miss a beat well i threw in some 7090 NGK plats and it ran GREATTTT for a week not a single miss well here i am 2 weeks later with miss fires out the *** not sure what to do next.



only things goin through my mind is the platinum gap was throwed off Or that stupid crap they sell u at autozone is making it miss fire im talking about the diolude grease and the anti seize cause i put it all on spark plug tip and wire and anti seize on threads.




i run chevron injector clean very often so i highly doubt i have a dirty fuel injector.

 

yo trav man, that car been giving u hella problems. Sorry bout that bro.

U run chevron so i doubt its the injectors too. U getting any codes on the misfire?

I would say clean MAF and TB.

If coils are new and plugs are new then it shdnt be that. U can inspect them. I use anti-seize but never the diolude stuff. That shd not cause an issue. But try to wipe it off and reinstall.

 

yah may try that next i may of went overboard with it.

 

well here i am 6 months later and Finnaly found problem for anybody else with these annoying random miss fires. Its the Dam Intake manifold gasket! even if u cant hear it! mine got a hella lot worse like miss firing almost everyday now and i hear at the intake manifold a huge vaccum leak lol.



so thats somethin to look into for other people with miss fires even know ur engine is fully tuned up and babied.