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Old 11-09-2005, 12:06 PM
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Join Date: May 2005
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420 SEL idles rough

1990 420SEL, 165,000 miles on it. has a "hiccup" at idle. not a solid miss, just a sporatic one while in gear. It does do it on a normal basis. I was wondering if this is common, and a tune up kit would solve, or if it is something else. Also, where is a good place to get a tune up kit (cap, rotor, wires, etc)?
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Old 11-09-2005, 01:01 PM
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Join Date: Jul 2001
Location: SoCal
Posts: 1,303
Could be a bad ignition part - but check compression too. Marginal compression in one cylinder could cause intermittant miss in just that one cylinder. First diagnosis would also include ignition scope and vacuum gauge reading.

Steve
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