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Ford Explorer Community - Maintenance - Modifications - Performance Upgrades - Problem Solving - Off-Road - Street
Explorer Forum Covers the Explorer ST, Explorer Sport, Explorer Sport Trac, Lincoln Aviator, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Ford Aerostar
i have a 91 ford explorer 4.0 4x4 xlt and i put a new used engine in it and it was revving at 4000 rpms. i found a vacuum leak on my brake booster. it is now revving a 1500 rmps put im only getting 10 mpg but before i put the new motor i was getting almost 20 mpg?