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  1. 6.5L Diesel Engine
    New(ish) to working on diesels. I have a 2003 GM Workhorse (USPS delivery truck) that is surging and very occasionally stalling. It’s got 136,500 miles on it. I have a cheapy OBD scanner that gives me a P0126 code “injector/injection timing control circuit”. Is this injector pump for sure or...
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