How do you change plugs on a 1999 crown Victoria?

To change the spark plugs on a 1999 Crown Victoria, first ensure the engine is cool and then disconnect the negative battery terminal. Remove the ignition coil packs by unscrewing the bolts and carefully lifting them off the spark plugs. Use a spark plug socket and ratchet to remove the old plugs, then install the new plugs by hand to avoid cross-threading, tightening them with a torque wrench to the manufacturer's specifications. Finally, reattach the ignition coils and reconnect the battery terminal.