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Hello, Due to the age and lack of maintanence records, a full tuneup would be recommended. More than likely, it has many hours of idle time that is not accounted for in mileage. Replace the sparkplugs, but pay special attention to the distributor cap, ignition rotor, and sparkplug wires. These deteriorate over time, and though functional, may not be at optimum operating condition. Another item of concern, would be carbon build up. An induction flush service, would most likely be beneficial to your engine's efficiency as well. Thanks