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What is the firing order for a 1983 ford f100 in line six cylinder 300 engine?

The firing order for a 1983 Ford F100 with a 300 inline-six engine is 1-5-3-6-2-4.

This means the spark plugs fire in that order, starting with cylinder #1 and ending with cylinder #4.

Keep in mind that cylinder numbering can vary slightly depending on the specific engine configuration, so it's always best to consult your owner's manual or a reliable repair guide for your particular vehicle.