Follow up. I have substantially improved the idle by cleaning and lubing the Idle Control Valve (ICV valve).

The idle is not as smooth as it should be, but it is MUCH better now. I still think the OVP may have been questionable as prior to replacement the car threw occassional SRS and ABS cel's which have as of now yet to return.

As always, appreciate the direction and advice.

Doug

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1981 300TD
2005 C55
2004 E500
1999 ML430
1992 400E
1998 C43
2001 SL500
1988 300SEL
1986 190E 16V
1991 190E 2.6