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What is the spark plug placement order on a 1999 Ford Expedition Triton 5.4L V8?

The firing order for a 1999 Ford Expedition 5.4L Triton V8 engine is 1-5-4-8-6-3-7-2.

Remember to consult your owner's manual or a reliable repair manual for diagrams and specific instructions before attempting any work on your vehicle. Improper spark plug placement can lead to engine misfires and damage.