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How do I speed up the idle on my Craftsman lawn mower

I have a craftsman push from behind lawn mower, It's only 2 1/2 years old. I bought it brand new from Sears and the warranty just ran out. The model number is 91738844. When I start the mower up, it just barely starts and will stay at a very low idle. It is impossible to cut the grass at this idle. I have already emptied the gas tank and replaced it with fresh high octane gas and the air cleaner is completely clean. There is a black plastic piece that holds the throttle door completely closed, I would hold it in the closed positon and the idle would pick up to about almost where it should be, but I can't hold this plastic piece and mow the lawn at the same time. Something is going on with the carburetor, do I have a spring missing, how do I turn up the idle. I think its something simple and the Sears service center wants $105 to fix it. I paid some where around $200 for the lawn mower 2 years ago. Please help if you can-Thank you

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Craftsman , Lawn Mowers
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14 Answers from these members:
Manage My Life
by Manage My Life
May 24th, 2011
Answered in 10 minutes
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Mark T
by Mark T Earned 58,303 community points in Craftsman
May 26th, 2011
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JOSEPH ADKINS
Mark, I am unable to see the images you described... today I was mowing under a large tree and I think some brush hit something causing my engine speed to decrease to just barely idle. I think this could help me too, is there a reason I am unable to see these images? Thank you
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Manage My Life
by Manage My Life
August 9th, 2011
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Mark T
by Mark T Earned 58,303 community points in Craftsman
August 10th, 2011
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Manage My Life
by Manage My Life
August 15th, 2012
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Mark T
by Mark T Earned 58,303 community points in Craftsman
August 19th, 2012
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Manage My Life
by Manage My Life
August 26th, 2012
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Mark T
by Mark T Earned 58,303 community points in Craftsman
August 27th, 2012
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Manage My Life
by Manage My Life
August 30th, 2012
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Mark T
by Mark T Earned 58,303 community points in Craftsman
September 1st, 2012
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Manage My Life
by Manage My Life
September 14th, 2012
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Mark T
by Mark T Earned 58,303 community points in Craftsman
September 15th, 2012
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Robert Pawelek
by Robert Pawelek Earned 7 community points in Craftsman
May 10th, 2014
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jcouts jcouts
by jcouts jcouts Earned 8 community points in Craftsman
May 4th
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