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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.
My 1996 ,4.0 Ford Aerostar just failed inspection.
Paperwork stated "system too lean".
Purchased a year ago I replaced o2 sensor,plugs and wires.It was well maintained by previous owner.Where do I start