Today the situation markedly deteriorated. Now it's a struggle to get above 2000 rpm. Very weak, very difficult getting up even moderate inclines, more black smoke. So maybe that rules out the resonance flap?

So really can't (shouldn't) keep driving it....I'll just have to take it in.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 161k miles
06 E320 CDI "Rutherford", Black on Tan, 180k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 147k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 81k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife