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hard cold start on 1999 6.5 chevy

  1. J

    Hard cold start on 1999 6.5 chevy. p0251 code

    Hi, need some help with this truck. When cold (80 degrees this morning) it cranks and cranks then starts and runs rough with black smoke. In a minute that clears up and it runs fine. If I shut it off, it starts right back up fine. We have two year old injectors, glow plugs are new and work...
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