Ok so had a missfire in the JZX90, but it has a vented carbon hood that was letting loads of water and crap get in around the plugs. So blew all the crap out and swapped the plugs to some new ones. pulled out some iridiums grade 8 put in some ngk copper grade 7 ( as they were cheap and if that cured the missfire was gunna get some iridiums/platinums in there) Now the missfire is even worse, and no water has got in there since. Before it was intermittent and would hold boost back after about 4,500 rpm Now it sounds like a machine gun when boost is about to come on and won't boost at all. Coilpacks? ignitor amp box thingy? Are the grade 7 plugs not cold enough and the water was causing it in the firstplace, the brand new but crappy plugs are causing an entirely new missfire? help! This is all on stock boost by the way.