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  1. J

    idling problems/plug quest

    I have two questions about my X... 1. My car when it is stopped at a stoplight, or parked it tends to idle a tad bit on the rough side. IAC valve was just replaced. lower intake manifold was replaced too. Do you think I should clean the MAF? Maybe the wires and plugs? I am up for...
  2. J

    system adaptive fuel too lean

    I plugged in a scanner into my PCM in my 1999 ford explorer 4.0 SOHC, and got the following two codes PO171, and PO174 "System Adaptive fuel too lean" Bank1 & Bank 2. If there is any info that you guys could give me I would greatly appreciate it. Thanks
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