1988 420 SEL RUNNING ROUGH

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1988 420 SEL RUNNING ROUGH

04-28-2001, 02:41 PM

John Willis

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My mercedes starts and runs at a very rough idle missing and spudddering as soon as it warms up it smooths out with just an occasional miss. I changed the spark plugs and the car seemed to run good for a couple of days then got worse again. also, when the car is running I here a hissing sound that is coming from a round cylinder next to the gas tank.
Thanks john

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