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CEL codes & some other questions
I have a 1997 Expedition 5.4L 183,000 miles. It's been idling rough for a long time, but has gotten really bad recently (drops to 500 rpm while idle, have to keep the throttle down while stopped). The check engine light came on too, got it checked and these were the codes - P0171, P0401...- LCM99
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- Forum: 1st Gen Ford Expedition Engine & Performance
