I just bought a nice 01` shortbed with 200k seems to run ok but has a shake in engine po300 code and po308 put new plugs and wires ,switched coil same thing pulled out pass side fuel rail and swapped and still there .Havent taken valve cover off yet no smoke no noise just seems to shake like a bad cylinder but still has power so any suggestions other than a new engine would be great havent checked fuel pressure but dont think thats it HELP