[damn dodge]

I have a 97 1500 sport with a 318, it was running kindda rough so i looked into it found it was throwing a p0308 code, cylinder 8 misfire. Found others misfiring as well, but not enough to throw a code. looked a little closer and researched it and found it was most likely the plenum pan gasket so i replaced it, swapped out the plugs, wires, cap, and rotar. Even ran some carbon cleaner to clean out what the burning oil left behind. It ran better than it ever ran before, but the problem came back a week later.... the code came back to. It's running rough again and at 45-60mph it bucks at low rpms but runs great at all speeds when reved up.

any help would be great!