My 2000 Grizzly has been cutting out when you get the speed up to around 30 mph. Now you can just hammer the throttle and the missing will stop and its runs perfect for a several mins and then the reverse (red) lights starts to flicker and then it starts to miss again and bad. Now you can just slow it down to the 30 mph and run it until that red light goes out and its runs better until you gas it some more. Whats wrong here or where should i start ? Thanks.