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engine idle very rough stops running at times, check engine light comes and goes on 1991 Lincoln Town Car

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I have replaced air filter.
(2) Answers
I had this same problem and had codes run on the car. Codes said I had bad EGR. Had this fixed. Had PCV valve replaced. Problem did not go away. Ran codes again and EGR code gone, but said misfire in cylinder #4. Was advised to replace spark plugs and wires. If this does not work then replace coil. Have not gotten that far yet. I think my car likes to play tricks on me. :-)
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