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need help with an xlt 1999

  1. W

    Hello to all

    First... Hello to all. We just swaped the engine on a Explorer XLT 99 SOHV. tHE NEW ENGINE SOUNDS WONDERFULL BUT AFTER 2 MINUTES RUNNING IT STALL AND THE ONLY CODE THAT SHOW UP ARE TELLING "FUEL MIXTURE RICH/POOR". We replaces the "Fuel Presure Regulator"... no help, replaced the fuel...
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