Misfire due to carbon build up on exhaust valves on Jeep Grand Cherokee

4.0L 6 Cylinder
Due to misfires, you may experience a loss of power when accelerating between 50 and 70 MPH (most noticeable below 32° F). This is commonly caused by carbon buildup on the valve stems, as a result the exhaust valves may close too late. All of the exhaust valves should be inspected and if necessary the engine should be decarbonized.

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Average mileage: 106,482 (9,900–200,000)
Engine affected: 4.0L 6 Cylinder
6 model years affected: 1999, 2000, 2001, 2002, more2003, 2004
14 people reported this problem
3 people shared problem details
2003 Jeep Grand Cherokee- 4.0L 6 Cylinder106,000
engine misfires in cold temperatures when heavy load is put on engine at highway speeds, also changed plugs and coil pack, did not help. still looking for help
2003 Jeep Grand Cherokee- 4.0L 6 Cylinder114,000
every once in a while, ill be traveling at highway speeds and my jeep just "jerks" kind of like shifting it from drive to N and back to drive really fast. i put some marvel mystery oil in the oil and gas and it has made it better but it still happens every once in a while.
The temp was about 41 degrees and I was hawling my boat back home and the engine light kept coming on and the car was jerking.
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