I'm wondering if this is the same problem I'm noticing on my new-to-me 87 300D. Engine shakes violently when cold if I get out on a high speed road (50MPH+). If I take the road into town (max speed 30MPH) no shake.

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1979 300SD 83k miles Astro Silver Metallic/Black leather #3447
1990 350SDL 202k miles (3L engine from an 87 300D)Black/Grey leather
2006 Pleasure-Way Class B MoHo (Sprinter chassis) 134k miles
2005 E320CDI 270k (car is sooo fast - I can't believe it's a diesel!!!)