Did you by any chance have an oil change done on the same visit to the mechanic? Just wondering. It is very easy to disturb the vacuum lines, and pull one or more loose, when doing the filter. (Or as Cooljay pointed out, he may have done the same thing by pulling the vacuum line through the firewall... though he shouldn't have been in contact with that if it was just the keyswitch you had done.)

For the door locks and shutoff, it does sound as though there are issues with the vacuum lines under the hood. It could be as little as vacuum line pulled out of a rubber joint. Look for a stray line open to the atmosphere.

As for the lack of power, I don't understand how a vacuum leak would cause that. Some suggestions:

First thing to check, if you have floor mats, is that the mechanic didn't move the driver's mat and bunch it up behind the accelerator pedal (or even drop some debris that is stuck in there).

Second, check that the pressure sensing line (plastic tubing, either clear or could be very yellow from age) running into the ALDA (mushroom shaped device on the top of the injection pump) is intact -- not only connected, but not split/broken.

Third, with the motor OFF, try moving the throttle linkage to see if it moves without binding.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22