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2000 Lincoln Navigator Question: 83,000 miles. The service light came on tonight. The speedometer showed 90 mph

 

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Navigator 1, Covington, LA, November 02, 2012, 18:40
 Rookie

I was only going 15 mph. Shifting seemed not good. Added 5 gallons premium fuel. Ran better. Speedometer acted normal. rpm jumped at times. light still on. running rough. made it home. Where do I start to fix this?

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