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-   -   420SEL Rough idle (http://www.peachparts.com/shopforum/tech-help/3757-420sel-rough-idle.html)

Al M. 04-05-1999 12:07 AM

when the car is in park, it idles high and low and the car seems to be shaking. does it need a tune up or is something more serious like the idle control. i appreciate any suggestion. i have also used gas treatment which has not improved it.

Benzmac 04-05-1999 10:32 PM

Take this car to a repair shop and have the engine put on the scope. This will check the secondary ignition system. (Where I always start)

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM




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