Well I traced some of the lines. The vacuum line to the transmission wasn't hooked up at all. Does anyone know how I can hook the line? I'm not sure about the routing or where it's supposed to hook up exactly. I know there's a vacuum modulator but I'm not sure where on the transmission.

Also thank you for the run down on how the Egr works! It appears my car just simply does not have one however. I don't believe it came factory without one but rather it was modified.

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1981 Mercedes 240D - Automatic transmission