Idle problem getting worse!! Helllp!!!

[RojoRocket]

Well, My problem with idle continues to worsen. Basically the car runs fine until sitting at idle for more than about 15 seconds, seeming telepathically linked, stuttering as soon as I wonder if it will, then getting progressively worse at high temps, and very bad when at idle with the AC running. Needless to say, it's been over 100 degrees regularly here in Sac lately, and anyone in the car can feel it, especially under AC load, including a friend riding in the car for the first time last week, turning to me and saying "that doesn't feel right??!!".
At first it seemed that if I slipped it into "N" it would stop, but now it's basically doing it all the time. When it's happening, in "N" I can bring the revs up, but it feels like it's stumbling, as if it's got a vacuum leak. Puzzling to say the least.
Cooling fans run normally, coming up immediately with AC activation, and as previously stated, the car runs great otherwise.

Reviewing symptoms in the FSM, the Bypass Air Control Valve sounds like a possibility. Anyone with any experience with this problem? Looks like I would have to remove the "collector" or "upper intake manifold" to expose and clean the connector contacts and clean and/or replace this valve. Opinions and suggestions please!!

Glenn