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I don't know if either item is the cause of your problem, but wiring harnesses and the ECM are not typically problems on '97 E420's. Wiring harnesses were only bad from '92-'95 anyway, so yours would be the first I've ever heard of failing on a '97 model.
Who did the diagnosis on your car? It sounds like they are grasping in the dark.
A typical cause of a rough idle on your car would be a bad mass air meter or a throttle actuator.
How would you describe your rough idle? Is it like an engine miss? Maybe all you need is a new spark plug or a coil wire.
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Paul S.
2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
Last edited by suginami; 06-01-2006 at 12:25 AM.
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