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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

Craftsman , Lawn Mowers
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Manage My Life
I understand how important it is to have your equipment working properly, especially when the grass needs to be cut. While you are waiting for your expert answer, I have found a link that will provide some information and instruction for the idle speed. I would suggest that you look at the parts diagram on searspartsdirect.com to see if there is a missing part. I hope that this will help you.
by Manage My Life
May 24th, 2011
Answered in 10 minutes
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