My cure...
Ok, I had this problem too, the board also told me to set the timing, which helped. I didn't set adjust my carbs cause the plugs looked nice. But after you warm it up, go for a spirited spin around the block, rev it full... that gets the little carbon chips out of the combustion chamber. I do that every once in a while...(hehe...) That should help some what. (Final solution, take the head off and clean the combustion chambers. But I don't think that is neccesary...unless you really feel like doing all that work. It actually makes me feel better that the engine wants to keep running rather than not run at all.)
Just my thoughts.