In search of why my car will not idle below 1,000 rpm despite adjusting the idle screw on the intake plenum, I started out by visually inspecting the throttle cable connection to the throttle body and found the cable to be unseated. As it turns out, a piece of the mounting has broken off.
When I set the cable back in, the idle comes down as it isn’t “tugging” from a cocked angle. So, this thing is moving around as I throttle up and down. Fabricating a piece should not be a big deal as a temporary fix whilst I source a replacement.

