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Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.
Hey how are you
1- have you scanned it and retrieved a fault codes of # 3 misfire ,was it P0303 ? or P300 & P303?
2- have you pulled the spark plug on #3 and check for spark
2010 Jeep Truck Liberty 4WD V6-3.7L
COMPRESSION CHECK Compression should not be less than 689 kPa (100 psi) and not vary more than 25 percent from cylinder to cylinder
4- have you checked for vacuum leak on intake manifold gasket leaking on #3
5-Injector pulse on #3
6-if you swapped the ignition coil from #2 to #3 to #2 and clear the fault codes and re-scan does the fault moves to #2 ,is coil bad ,you know how to check resistance on the coils and compare ,you need voltmeter
Please let me know
ASE Certified Technician
Hi, just checking in ,to see how things are going,Do you need further assistance ?