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What is wrong with string trimmer that won't open up?

I have a ryobi string trimmer and it wont open up and wants to choke down. Its like it is getting to much gas but don't have but one setting on it and it make it worst when I turn to the other setting.
Ryobi 30 string trimmer
Jim, April 2010
Possible blocked air filter or blocked muffler.

Husqvarna man, April 2010
link Click here to see other fixes for Ryobi.