I have a 77 puch maxi luxe and I have a few questions. I was out riding it one day and it started to act like i was flicking the run switch on and off till finally it died. I stood it up on the kickstand, started it up gave it some gas and it backfired then died again. I havent been able to start it sence. Got any clues? Its never done this to me before so im at a total loss. First major problem iv had with it sence i got it.