I just got done mounting the new throttle body and testing idle. Went for a drive and when I came back I popped open the lid to make adjustments on the idle screw as I was a tad high.

This is what I saw:
Click to view attachment

My test drive was about 10 miles, and the car drove down with the throttle flapping all over. It never jumped off the mount even with the screw broken. So now I order another throttle cable. Yay. I have no clue when on the drive it broke.

Zach

I've had that exact failure. I put a spring washer there now to add some compliance and reduce the load on the thread base.