This problem appeared on my 300TD today.
It happens only after a short on/off cycle with car running for less than 2 minutes from cold.
If I drive around for a bit, it shuts off as it should.

My assumption is that vacuum pump needs to build up "pressure" and it doesn't have enough vacuum for a brief on-off cycle.

I've seen numerous threads describing similar problem and most point to broken shut off valve or vacuum leak, if that was the issue in my case, why would it matter how long the engine been on for?

Appreciate any advise!

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1987 300TD (wagon)