The good news is, I cranked it again this morning and it stayed cranked.

I had to hold the accelerator for it to maintain about 1600-1700 RPM's and gradually let it idle down tentatively until about a minute later it would maintain about 1100 RPM's. as it warmed up, it finally idled (about 2 to 3 mins later) at 750 RPM's without cutting off. But, it is not as steady as before. If I rev'd up, it would not recover letting off the throttle fast enough to avoid cutting off without catching it with the throttle and easing into idle RPM.

But, that seems a good sign that it won't be hard to dial idle back in.