So, have a 99 Busa that is breaking up at high rpm--Above 8000 and high load on dyno, doing 100% runs right now. Getting misfires and all 4 coil codes show up. Changed plugs and checked charging-- it is charging well, still does it, going to change to another set of coils and check crank sensor wiring but anything else you all can think of?? AFR good all along.