2003 Trailblazer

By TJsDAZE
December 9, 2009 in Ask A GM Technician

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TJsDAZE

Posted December 9, 2009

When I first start the vehicle it has a humming almost rattling sound at the top of the engine(vortec 4.3) throttle body or carb. when it warms up and i tap the gas it goes away. Can anyone relate to this. Thanks Tim

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