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Why does a 1991 Ford Ranger have 8 spark plugs?

A 1991 Ford Ranger did *not* have 8 spark plugs. That's a significant misunderstanding. The engines offered in that year's Ranger typically had either 4 or 6 cylinders, meaning 4 or 6 spark plugs respectively. An 8-cylinder engine was not an option in the 1991 Ranger.