What could be wrong

My 2000 jeep cherokee 4.0L started to ping,skip&stall.I had it put on diagnostic comp. Tech said #3 cyl not firing coil bad. Replaced coil still the same.Runs fine until over 150degrees temp.jeep has 172,850 mi. Can I save it on social security pension

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Submitted 267 days ago...

Jewish989

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Pull the #3 spark plug and examine. A bad coil will not cause just one cylinder to missfire. I recently had firing problems with a 4.0L and replaced Champion plug, which were new but bent over to reduce the gap when heated, with AC plugs. Runs fine even when heated to running temperature. With a high mileage engine you might have another problem with spark. It could be a defective Oxygen Sensor in the exhaust maniforl or the "Crank Sensor" at the back of the engine in the bell housing covering the torque converter and starder flex plat gear. I have two 4.0L and found those items to be a problem with high mileage engines.

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