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    1997 Aerostar XLT with a 4.0L E4WD. The O2 sensors show 0 volts on a scanner.

    Aquired summer 2015, plagued with P0171 (lean bank 1), always runs strong, even at 75 & 80 Replaced numerous vacuum hoses/fittings, new plugs and cables, removed and cleaned very dirty throttle body. Replaced restricted fuel filter 5/2017: P0171 instantly went away! 6 to 7/30/2017: Drove from...
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