01-04.5 LB7 Duramax Powertrain
Hey guys, I have a 2003 GMC Sierra 2500HD with the LB7, of course. Anyway I had a 7.3L back in the day, but I have been out of the diesel seen for awhile and just bought this truck. I have been driving it for about a week and noticed my RPMs seem to be high. At least it makes me a little...