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IF you have a misfire you need to get a scan tool on the car to see what fault codes are being generated and what irregularities with the engine operation show up.
An oily spark plug won't be the cause of a misfire. If the plug is very heavily oiled up it may not generate a spark and you will run on one less cylinder. If you are down a cylinder on a 6 cyl engine you would definitely feel it but all the other cylinders would fire normally unless you had a misfire issue with the engine.
if your engine run before you changed anything,and you are talking about a 3.0 engine, you have to be careful changing wires on this engine, you need toonly change one wire at a time,the distributor cap on this engine is just stupid. if you look under the cap you'll see that a wire on the one side of the cap actually has a contact that leads to the other side of the cap. cly 5 cyl 6 cyl 3 cyl 4 cyl 1 cyl 2 front of engine
if your looking at distributor cap from front of engine, two screws hold down cap. look at the screw closest to the front,from that screw second hole to the left is #1. firing order is 123456 #2 wire will be at that front screw on cap,keep installing wires counter clockwise.
If it ran good prior to spark plug replacement, then yes, I'd be looking real close at the plug wire to that particular spark plug. Perhaps it pulled apart inside boot upon removal. It may even be an indication that they are all getting weak, and time to think about a new set if it's originals.