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you need: spark plugs, spark plug wires, depending on if newer system that is all. if it is older you will also need rotor cap and rotor button. label the plug wires and change one plug and corosponding wire at a time after changing the (cap and button).make shure the plug wires go on the new cap in the same order that they came off.
The engine has an oil leak, it's most likely either a valve cover [ most likely ] or the intake gasket. It sounds like the oil going on the exhaust manifold and burning off causing the smoke. This should be addressed ASAP as this is a fire danger!
The oil around the plug may be a sign that the valve-cover needs a new gasket. Oil on the plugs can cause a misfire but it is important that you check everything over. The misfire could be due to defective wires, boots, coils, spark-plug/s, injector/s, and so much more. Take a look at the cars maintenance history, Maybe it is over due for a complete tune-up or oil change. The car is 11years old, how many miles are on it? How was it running before this?
For 1991 Lincoln Town Car4.6 liter SOHC V-8 VIN "W" check Firing Order...
Make: LINCOLN Model: TOWN CAR - CARTIER Year: 1991 Engine: V8 - 4.6L - FI - - GAS Spark Plug Champion: Part Number RS14YC6 OE GAP .054" (Original Equipment Manufacturer and/or Original Equipment Equivalent)
Hope help with this (remember rated this post) Good luck.
Remove the individual coil packs located under the chrome fuel rails, just above the valve covers. Directley under the coil will be a spark plug boot, remove the boot & spark plug will be set into the hole. Will need about a 6" extention with a 5/8" spark plug socket to access.
Between the rocker cover and the fuel rail are the coils, one per cylinder hed in place by a smill 8mm bolt. Remove the coil and find the spark plug wire, the arrangement is called a coil-on-plug or COP. Spark plug is in the tube from whince the spark plug wire came. 5/8" deep socket and long extension will reach it. Another hint find some way to clean out the tube before removing the spark plug least all kinds of junk winds up in the cylinder.......SMith