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

 
Jeep Grand Cherokee Problem
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Model Year Affected: 1999

Engine Affected: 4.0L 6 Cylinder

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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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