Yes you have the M111 engine. But you have the Kompressor and I don't.

Yeah, what did you think when you pulled the cover off of that engine and it was factory clean inside? Take a look under the hood of a Toyota and see the difference, rusting parts here and there. The Japanese have been living off their reputation for years. It is especially evident at 10+ years of age, when Japanese cars ARE designed to fail.

Anyway, I will assume your CEL is not on? What specific symptoms are you having?

If it is a bit of stumble/hesitation, I would change the plugs and the connectors that are under the coils. That worked for me.

And I think you have a PCV valve on that one that needs looking at. (I don't have it on my car)

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra