Hi guys hope yous can help me out,so the problem is my car started missfiring around 4500/5000rpm so bought some superspark coil packs (bad idea) car ran perfect after that for the day then all of a sudden missing through the whole rev range really bad so put my old coil packs back in and ran fine only missed at the higher revs then I put my mates coil packs in that arent missing and ran fine at first now it misses a little here and there,and also noticed my boost gauge was showing 11psi at about 6500rpm could it be overboosting? Its only got fmic,straight through exhaust.any ideas? Thanks