The recommended spark plug gap for a 1991 Ford Ranger depends on the engine size. You
must consult your owner's manual for the precise specification. The manual will list the gap for each engine option (e.g., 2.3L, 2.9L, 3.0L).
Without knowing the engine size, I cannot give you the correct spark plug gap. Using the incorrect gap can lead to misfires, poor performance, and engine damage.
