12a problems
 

I have a 84 rx7 with a 12a streetported. Holley 600cfm. With msd igniton. Ok here its where i am haing problem. The car in low rpm runs good but ones you get to 6k rpms the car starts misfiring. iT keeps doing it all the way to 8K RPMS. i AM LOSING ALOT OF POWER CAN ANYONE HELP ME/