The Spark Plugs are on the cylinder head of the engine. Look for 2 or 3 inch circular modules - each is next to each injector electrical connector. Notice there are no wires - this is because each spark plug contains a coil and the coil in connected directly onto the sparkplug. Remove the coil connector for each spark plug (one at a time) and unscrew the nut holding the coil. You will have to stick a sparkplug socket with an extention in the hole to remove the sparkplug.
The above answer it true only for the 5.4L.
The 4.6L does have spark plug wires and 2 coil packs.
My 2000 has the 4.6 and it has the coil module on top of each plug
Sorry for not placing the year on my comment for the 4.6 twin coil packs, I thought it was talking of a 98, not a 2000, I believe Ford discontinued them(twin coil pack setup) in 99
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