Hey, i also have a sputtering problem... is it like only when you are cruising at a constant speed, and it just keeps on hiccupping? Then under accel. it doesnt do it? I have that problem, and am trying to figure that out now.

As far as my first post... Reason it was having trouble starting, and shutting down, the throttle was stuck around 2500-3000 rpm.. so it was trying to start there and shut down there.