I gave my saw a mild muffler mod, my coil was bad so i changed that, and rebuilt the carb, i have a jonsered 2045 (maytag) now its not running right it seems to be throbing at open throttle i adjusted the jets didnt seem to do a thing. i am not sure if i need diffenent jets or what i dont think that little tweek changed things that much. I sure hate to bring it to a saw shop for something this simple. any advice would be appericated (I am new at this mod stuff and want to learn