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Craftsman lawn mower tractor idle revs up and down

Craftsman lawn mower tractor model 917.276900. Under load (blades engaged) the engine runs fine, but when just idling without the blades engaged, the engine rpms go from high to low continuously as if playing with the throttle. What would cause this and how do I fix it?

Craftsman , Lawn Mowers
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2 Answers from these members:
Manage My Life
I understand that your Craftsman lawn mower idles up and down. While you are waiting for an expert to respond, I have attached some helpful links below that may provide information to assist you with your question. Have a great day!
by Manage My Life
August 14th, 2012
Answered in 11 hours
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