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cranking problems

  1. 04.5-05 LLY Duramax Powertrain
    I have a 2005 Chevrolet 2500HD Duramax, with CAI and 4 inch exhaust, I took my truck to school one day and parked it, went to start it 8 hours later and it was cranking but not starting, so i let go of the key and it starts up, found it wierd and was going to tell my dad. went into the school...