When the car is shut off, most of the time she'll run on. I hooked up a Mity Vac to the fuel shut off valve, barely 2 pumps and she shuts down.
A Russian mechanic I know (used to work on the oldies back in Mother Russia) told me in broken English that there's something vacuum related in the ignition switch (??)
My guess was a vac leak somewhere else. All the line, splitters etc. look good in the engine compartment. So it's a matter of testing each branch, etc. PIA!!