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Your car uses an ignition coil for every cylinder. Unlike in previous engines where there is a coil and wiring is routed to each cylinder, the coil sits directly on top of each plug.
A spark plug replacement may be in order as a maintenace step, I would recomend motorcraft spark plug as the Original equipment replacement
The engine firing order is 1-5-4-2-6-3-7-8.
Passenger side from Front to back 1-2-3-4
Drivers side from front to back 5-6-7-8