At the end of last season I was having problems with my Stihl FS 80R bogging down on and off when I would run it wide open. It wouldn't do it all the time, it seemed to come and go. Sometimes when it would bog down, if I brought it back to idle and then reved it up again it would come out of it for a little while. I don't know what else to check. My dad is a mechanic, but not for small engines. We've checked everything he knows about including the fuel/air mix ratios, I put a new spark plug in, and checked fuel lines. Does anyone know what else to check or what could be wrong? I want to try to fix it myself if I can to save the money from taking it in to my dealer. Thanks, jtkplc.