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If your Ford Expedition has starting running very poorly, or stopped running entirely while showing symptoms of lacking spark, your Ford Expedition ignition coil is most likely the cause.
Any time the Ford Expedition ignition wires exhibits physical damage either to the ignition wire or the boots, the Ford Expedition spark plug wires should be replaced as preventative maintenance.
Ford Expedition Copper and Platinum Spark Plugs by Bosch, Denso and NGK. Replace the Ford Expedition spark plugs once a year for optimum vehicle performance and increased fuel mileage.