The truck had the rotor and cap replaced, as well as the sparkplug wires, and the spark plugs changed. It misfires at low rpm, like when u are in traffic and you berely step on the gas, or when you are backing up. I also ran seafoam, and fuel injector cleaner through it. The codes that come up are p0300, p0302, and p0304. I know its just cylinders 2 and 4 and the p0300 is multiple cyl. misifer(2&4) but everything checks out fine. I replaced everything thought possible. I have no idea what else to do. The truck has 154,000 miles and its a 3.9 V6. The misfiring is more like sputtering sometimes, and makes the car shake a little. You can also hear it in the exhaust. I need all possible explanations if possible.
Thanks
Thanks