So I marked the current location of the idle air bleed screw with a paint pen, and I tried tightening it during high idle. It tightened about 3/4 of a turn before it stopped (fully closed). There was no noticable change in the idle. So I loosened the bleed screw 3/4 turn back to its original position. Clearly air is still getting in somewhere?
Vacuum line assemblies are new, ccv grommet and line are new, myself; as well as a smog shop smoke tested it to no avail, Intake gasket is new and bolts are tightened to spec, TB gasket is new, different EGR tested, I've plugged all the vacuum lines going to the intake while running (no change), and replaced IAC. All made no progress or difference.
The sign that still points me to some sort of a vacuum leak is that if I cover the IAC port on top of the TB when the jeep is idling cold, it stumbles and tries to stall, but when hot, covering the hole makes no changes.
I think the only thing I really have left to blame is the throttle body? Anything else?