It's a 722.4....so my choices are D, 3, and 2.

I'm hoping it's just the fuel filter....will change today. The only reason I wasn't suspecting the fuel filter is that, in my experience, a fuel filter being clogged becomes symptomatic suddenly...it's a very obvious loss of power. But perhaps it can happen more incrementally.

Another possibility is that I've become so accustomed to driving my CDI that I'm judging my W124 unfairly. My impressions are obviously very subjective.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 77k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife