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2008 GMC Sierra multi cylinder error / truck exhaust gets loud as warms up

Discussion in 'Chevy Truck Talk & GM News' started by Vanhagar5150, Jul 22, 2012.

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  1. Vanhagar5150

    Vanhagar5150 New Member

    I have a 2008 GMC Sierra 1500 5.3 that recently started having misfire issues and around the same times I lost power and as the truck warms up it gets a loud exhaust noise , Im assuming one of the Cat converters is failing or both and that is the exhaust noise from the doughnut gasket burning out . I am wondering if this is the reasoning for the misfires . Or do I have other issues . I have 8 of the best plugs recommended by GM for the truck ready to be installed . Any help on what to look for would be great.


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