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What is the spark plug firing order for a 1991 ford aerostar van on 6-cylinder?

The firing order for a 1991 Ford Aerostar van with a 6-cylinder engine is 1-5-3-6-2-4.

It's important to note that this information is based on common knowledge and might not be accurate for all variations of the 1991 Aerostar. For the most accurate information, it's always best to consult your owner's manual or a reputable automotive repair manual specific to your vehicle's year, make, and model.