The vacuum diagrams I have don't seem to answer my questions. In the first pic, there's a rubber vacuum connector attached to the side of the aluminum body of the device marked with a question mark, but no vacuum line plugged into it. (BTW, is that device part of the cruise control?)

In the second pic, there's a black vacuum line that ends with an open-ended rubber connector, again with no other vacuum line connected. This black line is not long enough to reach the connector described above. Also visible in this pic are the white and brown vacuum lines that connect to the device noted above.

Throttle and cruise seem to work okay. Am I missing something?

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That aluminum piece with the vacuum lines is for controlling the transmission modulator. Nothing to do with the cruise control.

Your cruise control is entirely electronic, as is the throttle control itself. The cable going under the intake does not go to the injection pump, but past it to the transmission. The smaller device where the pedal cable terminates is the position sensor. The computer reads that and adjusts the injection pump accordingly.

I'd have to look at my '96 to see where the lines go on mine. There are several lines open to the air on this car anyway.

Did anybody figure out if the items in the pictures are suppose to be like that or is something suppose to be hooked up to them?

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84 300 Turbo / 320,000
96 E300 D / 55,000

Looks like in the second picture you're missing an air filter for the vacuum (at least I presume thats what they are for)

You can see one in this picture of my engine bay, taken when I was fixing the duovalve.

The two coloured plastic lines in the 2nd picture look very similar to the vacuum lines used to control the height of the headlamp beam. Mine are violet and gray.

Oh and mine is RHD in case you're wondering. Where I live, we drive on the correct side of the road :p

Did you ever figure this out? I recently purchased a 96 e300d and found the exact same thing.