Rough iddle

Guest Rough iddle 03-29-2002, 10:02 AM

J.HIDALGO Fuel filter? when was that... 03-29-2002, 10:46 AM

DJNEWK2 the coil does effect this but... 03-29-2002, 10:55 AM

Guest A suggestion 03-29-2002, 11:20 AM

03-29-2002, 10:02 AM

targa88

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Rough iddle

I am a newbie, with a problem that is difficult to diagnose.
I have a C220(1995) with 240K-mileage. Recently, it has developped an irregular rough iddle. Car will start without problem, driving with normal acceleration, etc. However, chronically it will act as if not all cylinders are firing properly- rough iddle, surging RPM, etc. Put the car in park - condition continues. Turn engine off and restart - everything seems to reset and runs smoothly.
I though it might be the injectors, but cleaned them up with a liquid treatment. Took the car out for a long highway drive (1000KM).
A friend suggested that it might be an "engine coil" which needs to be replaced. IS this possible? What does it entail? Cost?
Any suggestions would be appreciated. Thanks

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