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2005 Chevrolet Trailblazer Question: what causes reduced engine power light to come on?

 

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gramasbisciuts, 4.2L 6 Cylinder, Middletown, OH, August 19, 2012, 11:52
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a whining noise comes from under the hood when the key is turned to acc. sounds to me like it is coming from the throttle body assembly

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