Read various "sluggish" threads...haven't seen my symptom addressed.

Acceleration, turbo boost, etc. are great from stop and at lower speeds. But, when I'm on the highway and I punch the accelerator, it doesn't seem as responsive as it should be....kickdown doesn't occur as quickly as it should, seems to take too long to accelerate.

I've changed fuel and air filters.

Any thoughts? This is the 1991 300D.

Thank you.

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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, 142k mi, wastegate conversion

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

Could the kickdown solenoid work at lower speeds but malfunction at higher speeds?

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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, 142k mi, wastegate conversion

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

frozen brake caliper? you can usually smell the hot brake material... couldn't get the car over 65 until I found out what was happening.

*shrug*

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1972 W115 220D/8 SLS, Coffman Starter "Ümläüt"

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with the under body trap ox, downstream from the turbo, have a look at this.

In post 29, I attached photos. I no longer have the same problem you describe.

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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
Raleigh NC - Home of deep fried sushi!