R80RT '86 had been sitting for 14 years, most of that outside. So far I've cleaned resealed the gas tank, cleaned and rebuilt the carbs, new petcock filters, fuel filters, cleaned petcocks, new plugs, valve adjustment, oil change, trans fluid, and battery. I'll be looking at setting the timing this weekend. Starts up ok, I can get it to idle about 1100 rpm but it constantly has a sputter or misfire. Video should show that. Where should I start with diagnosing this?