Mine did the same spitting and sputtering. It would get bad enough that I would have to blip the throttle to get home.

It ended up being a clogged fuel filter.

you know at first thats what i thought it was so i got a new fuel filter and spark plugs. sill nada. i appreciate all the input but sadly my girl can't quite do what i wish she could lol. if anyone lives near nc that wants some extra cash to get this fixed and maybe the a/c working, think its just unhooked?....let me know. got a block off plate from kevin at rotary resurrection, want to just run two cycle if possible....thanks again!