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You have the M104 inline 6 engine.
I would sugges checking your OVP.
Two other items to check that affect idle quality (other than Vacuum leaks) are the mass air sensor and throttle actuator.
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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".
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