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Performance Upgrades - Maintenance - Modifications - Problem Solving - Off-Road - Street Trucks. Covering the Explorer, ST, Sport, Lincoln Aviator, Sport Trac, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Aerostar. Featuring H.I. - Human Intelligence.
look here, sometimes old plugs w/ normal wear appear slightly rustyhttp://www.partsamerica.com:80/Maintenance/MaintenanceSparkPlugTips.aspx pita to get em out any way might as well change em while u r in there...