As posted before, Whatever you are using for an "ON switch" change it. Painless rocker switch, toggle switch, anything its a 5 or 10 dollar fix!!!! I chased a bad Painless switch for 4 weeks. Racecar idled fine and you could roll into throttle till a certain rpm before it started missing. If you matted the thing it was breaking up terribly from the get go. Would not have believed it till I had it happen to myself.