Well I just wanted to update on my isolation of problems.

I found the vacuum leak. I was having problems where the car wouldn't shut off when I took out the key. I was getting and holding pressure in the engine compartment, so when it was overunning after beeing turned off I found the damper that connected the vacuum to the door locks (door locks are yellow hoses with green/red stripes).

I put my finger over the damper and the engine shut off. There's a walk through for diagnosing vacuum leaks in your locking/unlocking system somewhere on the board. Anyway, it turned out to be leaks to my trunk unlocking and my fuel tank door lock. I set the fuel tank for unlock and the trunk for lock and then plugged the problem leaks.

This made the shifting a lot more definite and hard. Since then I ordered a new lever for the 3/2 valve and replaced a section of hard black plastic tubing going to the vacuum pump.

So far so good!

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1980 300D 300K KM - parting out
1979 300D 375K KM - parting out
2 300Ds for sale