I bought a 1997 E320 just over a year ago. Just turned 58,000k miles. I've noticed a slight lag when the transmission shifts. Let me explain: when passsing someone if I push accelerator pedal all the way down it seems that the rpms shoot up right away and there is about a 1 second lag before the trans downshifts. Also, when I floor the car from a stop there seems to be the same lag when shifting from 1st to 2nd.

You can start there. You may also have a vacuum leak. Any other symptoms/work on the car recently?

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J.H.
'86 300E