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2019SierraAT4

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  1. 2019SierraAT4
    I have a 2019 GMC Sierra AT4 with 6.2 liter and 10 speed auto with 33,000 miles. It recently developed a loud whine that was tied to throttle input. The more throttle the louder it got. Took it to my local GMC dealer and they found it was a bad idler pulley. They replaced the pulley and the whine is gone.

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