I put a new carb on it last year and a new fuel filter today. Problem: It first starts fine and revs fine and runs good. Shut it off and try to restart it a while later, it starts fair to poor. Once running, you have to go very easy on the trigger because it goes bla, bla. Once it clears itself it revs fine and runs good. I tried every method to adjust the carb including the Stihl method. Any ideas?