Changing spark plugs on lincoln town car

Remove the spark plug wires, remove the spark plugs,replace them. Do this one cylinder at a time if you never did it. On that year you may need to remove the upper intake to access the plugs on one side. In that case go to a shop. This would not be a novice job.

Follow the spark plug wires back from the ignition coil to the terminus. This is the spark plug boot. Disconnect the boot and use a spark plug socket (deepwell with a rubber stopper in back to protect the spark plug wire connection). Pull them out and install new using anti-seize on the threads. Replace your wires by matching the lengths with the old. Might want to do one wire to one plug at a time, that way, when you're done you've done both. Makes sure you have the right plugs in the right wires so that you don't cross firing order.