Alright the good news...

The car runs fine, the brakes work, and the AC works. I replaced the small plunger type switch at the ignition when the problem first occured, as the old one was messed up. The car turned off perfectly...several times.

Drove to work, car turned off fine...no problems...

I drove home, and now...won't shut off. At all. Won't even stumble itself down. The switch I installed worked when it was isolated outside the car...that is, when the spring was not compressed. Basically the ignition tumbler depressed the metal switch, allowing the car to start. When the tumbler is turned left, to turn the car off, the open area allows the spring to pop out and shut the engine down. This worked for 75% of today.

I drive home, get home. Nothing. I am going to clean out the switch and associated plumbing again, but short of this what the hell could it be? There are only two lines that go to it. Baffling, but I will sort it out...I hope.

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1976 300D
190,000 Miles
Colorado Beige

1975 300D
Parts Car
78,000 Miles
Rustbucket
Also Colorado Beige

1984 190D 2.2 (Dad's)
156,000 miles
Champagne Metallic Clearcoat