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For about 2 weeks now my 2006 GT has been squeaking on startup and durring acceleration. Now I know it could be the tensioner but the sound seems really prominent towards the right, near one of the idler pulleys with teeth because it does have some slight wiggle.

Now if so, can i just buy this part at O'Reiley Auto or?
 

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Remove the drivebelt and just spin each pulley manually to confirm which one squeaks. The idler pulleys are the most likely culprits (both the grooved pulley and smooth-edged pulley) and replacing them is easy as pie. Any good auto parts shop should have them in stock.
 

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My guess is the belt is wearing funny which could be the result of a bad tensioner, bad idler pulley or failing harmonic balancer.
 
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