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  1. Question: Loping and spitting black smoke on acceleration

    Duramax Fourth Generation: 2007.5-2010 (LMM)
    Hey guys I got a 2008 lmm with 200k miles efi live threw korey Willis s&b cold air and just 4 in down pipe back to a stack i when out yesterday around 12 fired it up (wasn’t the first time in ran yesterday) it was 33` outside put it in reverse and it started to sputter and blow white /black...
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