Not necessarily, my idle control valve was not getting power at all either. A new (used) controller fixed that problem. It looks like the one that was in the car was rebuilt at some point and not a very good rebuild. I had at least one bad capacitor inside. Now I idle, but I have several vacuum leaks to track down to get the idle stable.

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Adam Lumsden
(83) 300D
Vice-President of the MBCA International Stars Section