just a follow-up:

1) replaced front engine mount - helped a little, not as much as i hoped
2) cleaned fully clogged screen on iacv, didn't even know it was a screen till i poked at it and a chunk of carbon crusted off - helped a little
3) tweaked the idle set screw.

Turns out it's not the AC compressor on by itself, but the combination of: Drivie, AC on, fan medium, headlights on, and the radiator fans kicking on causes the vibration. It's much better now. Shouldn't the ECU signal the IACV to allow more air during this condition via the ELD, AC signal, A/T signal, and such? How reliable is the DTC for IACV, w/ my fairly (if not fully) clogged screen it didn't set a code!? Could this be an alternator thing? Under thoses loaded conditions the voltage at the battery were 12.9vdc, unloaded it's 14.1.

I'm not sure about the tweaking of the idle screw. I must have turned it 2 complete turns open. The rpms do a funky blip to 1.5k (almost) every time I release the gas to slow down for a light. But I want to say it's happening less - is the computer still learning? . I may try putting that back to the desired 550rpm (w/ IACV disconnected) if the wierd blip thing continues. I don't think I let the compter relearn long enough. Is 60 sec of idle enought (engine warm)?

Will read my Helms manual some more but it's 80% better now. Let me know if you guys have other ideas.