Here are some considerations. This car has very deep "manhole like" spark plug wells or valleys. The problem is that as the car ages the valve cover gaskets may allow oil seepage into the cavities. Unfortunately [coil on plug units] which are present on this car; are very susceptible to misfire with the presence of oil, water or any foreign matter in the spark plug valleys. You will have a misfire with respective 'OBD 2' code.
A Lesser occurrence is [coil on plug] failure which could also cause this problem. If you know how to test a [coil on plug] unit with a multimeter it will be very helpful to your diagnosis. the last thing would be either the spark plugs or the Engine Electronic control unit having a problem sending grounding signals to the coil on plug units.
FYI. The problem with oil in the spark-plug well is not only restricted to this make or model vehicle.
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firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Lincoln LS ( V8 )
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