Idle went nuts.

By the way... anyone who has read some of my posts may come to the conclusion that I am, in fact, an idiot. Believe it or not, there is nowhere else in my life where these kind of incredibly dumb and costly mistakes happen. Yet I love these cars and cannot give up what has become the most satisfying and fun thing going.

Thank you, in any event, for your help. Will update when I have more information

Here's what strikes me. within the past couple of weeks,,,, I don't recall what was the thread title or topic, I posted a memory story about a friend and his Camaro. The little piece of all thread that had held the breather on dropped into and fecked his engine. That incident was more than 30 years ago.
Then I see this/your thread and think, "Speak of the devil".
Maybe knowing this kind of thing has happened to others helps in some way. Good luck

p.s. Damned if I do? Damned if I don't? For anyone reading here...
Cement blocks crack and drop cars on people. Buy and use jack stands!