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, 160k miles
06 E320 CDI "Rutherford", Black on Tan, 180k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 79k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife