Finally! After a lot of reading and help from "generous with their time" forum members I have had some success.
I got under the car and with the aid of a small socket set was able to access the stop screw. I screwed it in one turn. This action changes the position of the vanes at low revs. This is when full vacuum is applied. The engine at idle immediately felt smoother. There was no stutter or surge in power anymore during a 20 mile test drive. Thanks again to all that share their wisdom and experience online.
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