Need some help/thoughts 2002 QC LB 2500 ram 4x4 5.9gas headers, K&N, MSD (Igint, Coil, Plug Wires)Superchip. 103,000 miles. Well maintained does not smoke or make any noise, Unpluged PVC Hose and the pass side hose blocked off held hand over oil filler port the engine built up pressure not vac. Intake gasket should be good, never has used oil,plugs are clean. Truck wt. #6500 4:10 gears Michelin LT265 on a recent trip 325mi got 13.85 mpg. Heres the prob, keeps giving a p0301 code (#1 cyl misfire) New cap and rotor, new plug, changed out #1 plug wire, new injector, stll same code. Using an Infered thermometer #1 cyl runs about 160 degs cooler than #2 and idels rough. What are your thoughts?

Mr.Runum