I posted this in tech support with no responses for a few days.

83 300D 230,000miles. I get the failure to turn off. I replaced a piece that fits the vacuum hoses on top of the engine and all was well. Then I had my mechanic replace all the engine mounts and dampers in an effort to fix a rough idle and now it's taking 10 seconds to turn off again.

All the hoses under the hood are making well seated connections. I did notice one line going into the firewall that you could pull in and out with ease. I didn't try to pull it out all of the way....

How do I track down the leak? Is this something for the MB Dealer? I'm starting to lose faith in my indy mechanic as he is honest but horrible at diagnosis apparently. (my rough idle has been going on for years. since beginning of year I've replaced injectors, had valves adjusted, fuel filters replaced, dampening screw replaced and adjusted, and the engine STILL rocks badly while in Drive with the AC on)

Thanks in advance.
Matt