Q: cylinder number 4 has a misfire.

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My jeep commander is showing a #4 cylinder misfire. My Mechanic thinks that it has something to do with the valves (sounds like one is hanging and it is rattling) what is the typical cost of taking aprt the valve cover assembly and getting in there?

My car has 113000 miles.
My car has an automatic transmission.

Billing question sent to CS for the cost to diagnose and repair a possible burned valve on a 2008 Jeep Commander with a V6-3.7L engine.

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