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    2001 LB7 problems

    Hey y'all - My brother has a 2001 Duramax and been having a lot of issues with it lately. First we had injectors and CP3 fail, and now it's acting up again. At first, it would only act up when the A/C was on and the blower fan set to 5 - setting it to 4 and it would run just fine. Now it...