Stihl weedeater starts but won't run at high speed

Late entry:
OLD FUEL. Today's modern lead free Methanol fuel "SUCKS"
Besides the reduced fuel mileage (6 out of 7 vehicles in the family) It also decays rapidly destroying the carburetors of small engines.
If your gas is more then a few weeks old during the summer months, it's probably shot. Empty your tank and carefully mix new fuel. Try starting and running your wacker again. You have nothing to loose. Worse case you have 2 gallons of fuel so you can do the neighbors yard too.
I thought all the new Stile engines had electronic ignitions anyway. There are no timing adjustments. If new fuel doesn't help it may be time to learn how to replace the carb gaskets. The fuel pump is part of the gasket and the NEW MODERN SUPER FUEL causes them to get hard and they don't pump. If you aren't into working on engines , take it to your local Stile repairman (NOT the local back garage fix all guy). He might be able to do it but the Stihl guy knows how to do it correctly. I do my own but I know my Stihl guy very well. )Woods Cold Storage, Woolwine, VA (I hope the plug is ok with FixYA I am not related to or work for any one in the small engine industry. This is a plug for a small county guy that does excellent work.) Late entry: OLD FUEL. Today's modern lead free Methanol fuel "SUCKS" Besides the reduced fuel mileage (6 out of 7 vehicles in the family) It also decays rapidly destroying the carburetors of small engines. If your gas is more then a few weeks old during the summer months, it's probably shot. Empty your tank and carefully mix new fuel. Try starting and running your wacker again. You have nothing to loose. Worse case you have 2 gallons of fuel so you can do the neighbors yard too. I thought all the new Stile engines had electronic ignitions anyway. There are no timing adjustments. If new fuel doesn't help it may be time to learn how to replace the carb gaskets. The fuel pump is part of the gasket and the NEW MODERN SUPER FUEL causes them to get hard and they don't pump. If you aren't into working on engines , take it to your local Stile repairman (NOT the local back garage fix all guy). He might be able to do it but the Stihl guy knows how to do it correctly. I do my own but I know my Stihl guy very well. )Woods Cold Storage, Woolwine, VA (I hope the plug is ok with FixYA I am not related to or work for any one in the small engine industry. This is a plug for a small county guy that does excellent work.)