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These are not slow cars. Something is wrong. Start with easiest...replace the fuel filters (and air filter while you're at it). But plugged fuel filters could account for your symptoms by themselves. Or another restriction in fuel flow.
After that, take ALDA off to see if there's a big difference....if there is, then you can decide whether to leave off or adjust/shim.
The pressure converters (vacuum actuators) can go bad....there are three of them on the 91. That happened on my 92 (which has just two of them)....replaced them and it was a NIGHT AND DAY difference. But the simplest solution (which I haven't yet done on either of mine) is to replace the vacuum-actuated wastegate with a pressure-actuated one. GSXR has a great thread on this. You basically get to eliminate all the vacuum crap on the passenger side of the engine compartment.
Others can chime in with other possibilities....
Sounds like a good find....once you get the slowness thing figured out you'll be thrilled.
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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
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