Avatar, Just in Time, and Cool! Thanks a 'heap' for your responses. I will need to get my 560 from the NY-Long Island location to southwestern PA (near the Pittsburgh area) where I will pursue the various suggestions in an effort to resolve this rough low rpm engine running problem - idling. I will definitely keep you informed. It is now Monday, February 12, and I plan on visiting the MB 'oldtimer' mechanic with these suggestions, although I will not have the car with me until next week. Of course, this depends on the predicted 'NorEasterner' storms due the New England / Eastern NY / Long Island area this coming week. . .end.
Continued appreciation.
kilyab