Sounds like a problem with the throttle valve.
you will have to remove the air inlet (item# E) then pull the spring out (item# 37) and look to see if you find any foreign objects, if not the proceed to pull the throttle valve (pin cover) (item# 37) and check the seal (item# 34) for wear.
Follow this link for the parts manual:
http://pdf.lowes.com/useandcareguides/879686002796_use.pdf
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