Rough idle @ economy guage not working 420 SEL

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Rough idle @ economy guage not working 420 SEL

01-09-2002, 02:55 PM

bermuda

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Rough idle @ economy guage not working 420 SEL

I lent my 1988 420 SEL to my father inlaw and when I got the car back the idle was rough. He had filled the car with gas so my first thought was bad gas. I have already run Three quarters of a tank of new gas through the car and it is still idling rough. I also noticed that the economy gauge had stopped working. Could a vacuum leak cause a rough idle?

Thanks

Dave Schwartz

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