Presently I am on a business trip and my wife has my '83 TD at home. The car, intermittently, wont shut off by the key. She knows to shut it off by the emergency lever in this situation, but only has to do this every so often. How can a vaccuum problem being intermittent? I ordered and it was delivered to my house, a Mighty Vac tester. I'll be home next Friday to dig into this. The door locks are also intermittent. Is this a sign of a pump on its was out? Any help would be greatly appreciated.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member