Well Larry, you may be on to something there as far as the enigine being apart at one time... The #1 and the #5 piston were replaced at 132k. The engine does "bounce around" a little, but I assumed that new motor mounts ought to lessen that, and that the new pistons probably have a little better compression than the other three, adding to the shaking effect.
This has me really frusterated...to the point that I actually looked at used Jap. cars today. (forgive me-I am under a little stress). The car otherwise runs great, and I am happy with it.

thanks for any insights/comments

-Larry (no longer bragging about the reliability of his 300D)

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03/83 300D
07/73 280