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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 :)

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Hey mate, see how you go with new plugs gapped correctly, if not, open the bonnet at night and look in the coil valley with the cover off, I had a similar issue and the faulty coil pack showed up straight away, flashing when earthing out through hairline crack. If you pull the bad one out you should be able to see

an area of discoloration (rainbow on black) where the spark was earthing to.

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