I can just about gaurantee you that it's the IGN or the caps. A fix is to put a C&H on it, or like Foxbat suggested, dump it, and get a DA. I had an 80 do the the same thing some time ago. Had to resurface the carb block, straighten the crank, replace the caps, and finally replaced the IGN. I then sold it...got tired of messing with it. All engines have some troubles I know, but not all of them have the same troubles over and over except for these 3w's. I've seen it over and over, and before somebody thinks about flaming me, I've helped the guys fix these problems at the field *many* times, so any flames would be meaningless. Just stating the facts...