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Discussion Starter · #1 ·

I have a 2001 Jeep Wrangler 4.0 with only about 58,000 miles. I’ve recently developed a misfire. Codes P0300, P0304, and P306. It is difficult to start, has tough idle, loss of power driving, and has shut down at 3000 rpms. Engine does not overheat and I do not have a loss of oil pressure.

I’ve changed the coil pack, spark plugs, injectors, cam shaft position sensor, and 02 sensor. I initially was fearful of a cracked head, but my oil isn’t milky, no White smoke out of the exhaust, and radiator fluid clean. Upon doing a block tester kit on the radiator I am not getting exhaust fumes in the radiator.

I’m honest at a loss of what to try next. Possibly excessive carbon build up on the valves? Catalytic converter clogged up? Bad ECM?

Any and all advise is much appreciated.
Thanks in advance!
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