Have a 2020 900 ace . Yesterday twice it started loosing power wile i was driving along at 50 mph and when i give it more throttle it would sputter and back fire, drove it til it would hardly haul its self then stop , Shut it off for a couple of minutes start it back up work perfect again. 40 miles later same thing. Shut it off let sit . Started again drove 50 back to camp worked great. Today put 145 mile on no problem . Can any one tell me what i should at for the problem?