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    Check Engine Light On -po174 when plugged few hours runs okay

    Hi Everyone Check Engine Light On. PO174 :( Problems is when I start my vehicle up [1998 Explorer xlt 4.0L SOHC] in the mornings with a/c and other controls off, it runs rough, idle varies up and down, almost to stall, hard to control with throttle peddle, :( ,after warms up for a few...
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