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

by in Middletown, OH on August 19, 2012
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1 answer
ANSWER by , August 19, 2012
scan eng codes and post so we can adv