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    Erratic/fluctuating idle while in P & N

    Our '92 Explorer 4x4 4.0L just started doing this and there has been no work done on it recently. Cold start is good (and by cold I mean -30 to -40 C) but after 5-10 minutes of warming up, the idle starts to rhymthically fluctuate from about 600 to 900 RPM. When it's put into gear, it will...
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