I've noticed that, in the early going, my idle is high....but ONLY after the car has sat undriven for several days. If I've driven it the day before, everything is fine.

I had the throttle linkage lubricated, but that doesn't seem to have helped.

Any thoughts?

Thanks.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

Automatic transmission?

Yes, auto trans.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

High? How high?

Hard to quantify...moderately high? It's not like the engine is racing or anything. But high enough to be obviously noticeable.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

Does your tachometer not work(I'm guessing your 1992 300D 2.5 Turbo, BTW)? If it's under 900rpm in P or N, I would not worry too much. Just let it warm up for a few minutes to get everything circulating.

I believe the idle is computer controlled on the 92.