99 chevy silverado 2500 5.7 reg cab 3/4 ton long bed 4x4

Be sure the intake manifold has been re sealed properly and the quick connect heater hose fitting at the front passenger side of the intake manifold has been replaced with an old school fitting. I have the same engine in a 99 Tahoe and at 218K it still runs great. I think the timing chain is getting tired tho. It has plenty of pep for driving around but I could not imagine it pulling much of a trailer!