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Re: 2004 GMC C8500, Engine runs rough intermitantly
Posted to HD/Fleet Forum on 1/27/2007

The driver told me about the problem, just as I was getting ready to leave, so I haven't looked at it this time. I will have to look to make sure, but I think it is a cummins engine. I All I have is the Genisys and DRBII, so I don't think either one of those w... Login to read more.