Odometer 280000, 70,000 Miles on replacement engine (2015) Its old!!! A/C inop(Freon leaks out, probably compressor seal) Heater Core Leaks(Heat works, but fogs up windows) Check Engine Light indicates misfire Cylinder 6, also knock present Cylinder 6 after warm up. Changed plug and Coil Pack, to no avail./// UPDATE…. TRUCK CURRENTLY AT BATTEN AUTOMOTIVE GETTING DIAGNOSED, WILL UPDATE ONCE THEY CALL. One owner truck, I have had it since the showroom floor. New radiator, cooling system hoses, alternator, battery.