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

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

Asked by for the 2005 Chevrolet Trailblazer
scan eng codes and post so we can adv
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scan eng codes and post so we can adv