Frank:
Thanks That helps. Do you read it to mean that the valve is closed when the MPH is over 12, even when it is not in closed throttle coast-down or only when it IS in closed throttle coast-down? One minor problem with the above is the ICM doesn't have a speed input on my 84 500SEL. RPM is the only indication of speed. Right now, I have my ICV open when above 2000 RPM cruising. It slowly closes the valve if in coast down mode and below 1500 rpm. I have no problems with bucking doing it this way. So I guess I can close this book and worry about something else.

I have had this car for over 12 years and the last 4 or 5 months is the only time it has idled consistently.

Thanks again Frank and Elektri for the replies.

PaulM

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84 500 SEL (307,xxx miles)