I have a 98 ram 5.2ltr. I get CEL P0300,P0302,P0307 most of the time after I try repairs. Then the other cylinders code randomly. I have change plugs, wires. distributor cap, rotor button, coil, fuel pump but keep getting the codes after the truck cycles. It starts and runs, is drivable but you can feel the miss after you reach about 40mph. I'm scratching my head trying to figure out what I can do next. Any advice is appreciated.

 

how's the plenum? (see stickied thread at the top of this forum)

Might consider doing a cylinder leakdown test as well....

Welcome to DF!