Colby Ackerman

So I have a 2007 Jeep Wrangler with the 3.8, having a misfire code P0306, I changed the spark plugs, wires, the injector, and the ignition box. Still has the misfire. The head gasket is good. I also have a code for all 4 of the O2 sensors, could that cause the problem? I need help because I can’t figure it out. Does anyone have any ideas or know how to fix it

JonesboroJeep

I would look at the cam or crank shaft sensors which usually cause a lot of problems in the later models with the 3.6L. I would look at carbon build up on the valves which can cause misfires. I used the CRC Intake Valve deposit cleaner and it made a dramatic difference and reduced misfires after only one treatment. You will probably need multiple treatments. You changed your injectors so the lucas isn't needed but I normally would put some lucas fuel injector cleaner in the gas at a strong concentration to clear out your injectors if that is a problem.