Well, as its due for them, and it's usually the cheapest and best thing to do first, I'd do good ol' plugs and leads (wires).

For some reason, copper is much better than platinum plugs in most MBs.

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg