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The M103 2.6L in our 190E is dead smooth at idle despite having original engine mounts and tranny mount. I did a full tune up on it recently and a VERY slight idle shake was solved with new plugs, wires, etc.
The typical culprits for M103 idle shake have all been convered here. Check that tranny mount is it seems like the car is firing properly. If it's fine, check for vacuum leaks, EGR valve and tune up parts (cap, wires, etc). Failing all that, have a compression check run to see if maybe a cylinder has died.
Oh, and top off the tank with "known" good gas.
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