I should have read the Moderator's suggestion to do a search first. Newby problem!
Having done it -after posting- ,I found a wealth of Info. covering the shaking issue, which appears to be a common problem.

I understand now why I didn't get a response to my question and thanks to all who had and documented their issues and of course the knowledgible responders with their helpful answers.

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1985 300SD Turbodiesel - wife's car
1985 300TD - my car