I have a Stihl 025 Chainsaw that I love and over the years of use it has never once failed me until now. The saw started and ran most of the day and then I refueled and took off again only for it to just loose power and die. It would not restart. After cleaning the carb and putting in a rebuild kit it fired right off and reved up good. after a couple minutes it lost power and died. I never messed with it for a few days and went back to try it...It started and ran then died again. Would not restart. Noticed that it sounded like it was not fireing and tested the plug. No Fire. Bad coil I thought. So I got an aftermarket coil and put it in. Still no fire from the coil wire. Returned the coil for another and STILL NO FIRE from the coil. Maybe I didnt install correctly??? Yes I have checked the kill switch wire. What could this be??? and how should the coil be installed just to be sure im on the right track?