Looks like the upper plenum brace gets removed and from reading on MUD some long ratchet extensions will get you there from underneath. Sounds like the VSV can be checked pretty easily per the FSM. Need to check for dry/rotting vacuum hoses. Not sure what/where the vacuum modulator is, maybe I'll find a picture of it or figure it out once I'm under there.
Oh, this thread has good pics of how to reach the VSV (and shows the long extension):
Maybe I should move it to the fender like this guy:
"Stay the Trail," "Tread Lightly," and "Leave No Trace" ethics
Rising Sun Bio
2F "Brahma" + Lockright, tach, Warn 8274, FJ60 Power Steering,
soon to lose the Sanden OBA
to go back to factory emissions
Limited TRD 2UZ-FE FOR SALE SOON
Up next: Something that makes a funny whistling noise...