OK...my car runs fine until about 4200 rpm then starts to break up. I'm running around 20 lbs of boost and 43 lbs fuel. I ran direct scan and it was telling me that everything was fairly close to what it should be at but..? Yeah i'm lost..I'm going to start with plugs then if nothing improves the coil will get replaced? So if anyone has had similar problems please give me a shout!!