Originally Posted by 1SIKAP1

Billman please chime in.Update!!... So I took it to raceline to get the vafc2 tuned, when he starts to play with the settings he notices the missfire, he starts messing with the settings and tells me to notice that when he adjusts a certain setting on the vafc the misfiring stops, I asked which setting it was and he said he was messing with the fuel setting, when it was at +40 missfire would go away and but very very slowly start coming back, almost non existent. Then he would put it back to zero and it started misfiring like crazy, he said I needed to rebuild my head, and not to tune till I fixed my head, he quoted me 1100 including parts. Could it be my ecu?? Or is it the head??... Help!?!