On average, the 2002 GMC Sierra 2500HD starts to “feel” problems with the ENGINE and its various aspects after 0 miles.
Recently reported ENGINE problems on 2002 GMC Sierra 2500HD
Three broken manifold bolts. from what i hear this is a common occurrence. the broken one close to firewall, will have to pull engine to fix. there should be a recall on these manifold bolts. *tr