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6.0 Liter Chevy HD 2500

tgnealtgneal Posts: 1
edited April 2014 in Chevrolet
My new 2500 chevy started knocking at startup at about 11,000 miles. The dealer said it was carbon build up. It started again 2,500 miles later. The dealer now says GM is not covering this because it is a maintance item. It Knocks for 2 minutes at startup. Please help with any suggestions.

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