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  1. Duramax Second Generation: 2004.5-2005 (LLY)
    05 Sierra 3500 dually - no mods - 330k miles. A week ago I started up - ran for 30 seconds and just stopped. Start up was completely normal. I’ve gotten as far on diagnosis to determine There is only air bubbles exiting when I “crack” high pressure line fitting above right bank. I am ready...
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