MGlavin thanks for the help. No computer radio here, just a basic 6 channel. I have already checked and tried the things that you mentioned. I found that the problem was in the arm between the bellcrank and the carb. The manufacturer use some type of ball link that would allow a little bit of slop. The vibration of a the engine would not allow the bellcrank and throttle arm to hold a steady idle..it is not a firm connection. I will work out a straight shot to the carb that will hopefully correct this. Does anyone else that has a US41 have this problem?