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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.
It is impossible to give specific advice with so little input. I suggest they take the vehicle to a parts store and have them retrieve any trouble codes. They will do this for free. Then come back here and report what they found.