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Spark plug firing order for 2003 ford f-150?

The firing order for a 2003 Ford F-150 depends on the engine. Ford F-150s in 2003 had several engine options. You must specify the engine size (e.g., 4.2L, 4.6L, 5.4L) to get the correct firing order.

Once you provide the engine size, I can give you the accurate firing order.