Your carbs need cleaned...Just make sure that you have someone that knows what they´re doing...The carbs WILL have to be syncronized after repairs are made...There is a build up of gunk from this new gasoline...BIG MISTAKE ON THE NEW GAS!!! After you have the carbs fixed; run some 104 octane boost and fuel injector cleaner through the tank at least 3 or 4 times per year...