Duramax Third Generation: 2006-2007.5 (LBZ & LLY)
Maybe the wrong spot if so my apologies. New to me 06 LBZ ,stock everything. Replaced fuel filter after a P1087 low fuel rail pressure code. Cleared code. Pulled camper 7800lbs ish, ran like a beast until about 30 minutes into the trip 65mph highway, went to pass a boat and check engine...