2010 RG with A Dyna Jet Having several issues. It started with one cylinder not firing. Shut off engine and restated fine. Next when I get above 4500rpm its just like I hit the kill switch on the bars but let off throttle and it comes back to life. This is intermittent does not do it all the time. So far have changed voltage regulator and battery. Also get O2 sensor trouble codes that can clear but come back as soon as the engine is restarted. Any ideas? This has been in the shop now for the 3rd time. And of course wont happen for the mechanic while on dyno or test ride. The only difference I am 300Lbs and he is 175Lbs not sure if that would make any diffference.