Originally Posted by Troy5061

Anyone ever get a p0300 random missfire code, cylinders 2,4,6,8 on the passenger side are all misfiring but the drivers side bank is fine. Running out of ideas, has new ac plugs, new ac wires, new fuel filter, checked fuel pressure and its good, new injectors and fuel rail, got a used computer and got it reflashed and nothing, has good compression. So I was thinking the right side cat plugged but it appears to be working on the scan tool and with a temp reader gun. Its missing so bad it sounds like its knocking, any ideas??? The vehicle is a 2002 1500 with a 5.3.