I need a little help with a Husqvarna weedeater. I have a 322L and when I start it the motor surges. At full throttle, the motor will reach top RPM for a few seconds(10-20) then the rpms fall off to low idle and sometimes it just dies. Carried it to two Husky repair shops and still no resolution to my problem. The motor still has good compression and I have serviced the system per the owners manual. Still a good machine, I want to fix it. Has someone else had this problem or know of a fix?