If the car has a very pronounced shake when hot it's usually the damper screw for the rack in the injection pump(rack limiter screw). Mercedes made an "updated" screw for those with more spring tension on the pin to dampen rack ocillations. It's a cheap part and easy to install(screws into rear plate of pump). I'd do that first. If it needs motor mounts...it needs motor mounts. If it needs an air cleaner bracket or mounts...that's fairly obvious too. But to fix the "loping and shaking" syndrome, the rack limiter is the fix(unless the pump itself has a bad delivery element, then it time to rebuild the pump). Check the archives, I think either me or someone else has published the part number before.
Regards,
Randy D.