I think you have 2 TBs with the same defect,,,The Auxilery Air Valve,,,thermostat wax pellet controlled gizzmo.
I Emailed you how to very carefully take it apart and boil the bottom in a pan and see if the valve closes...Did you do that?????
If your friend can carefully stick it in a vice ,,padded with a couple pieces of wood,,,.Remove TPS and ICS to prevent vibration damage.
Soak phillips screws overnight with P Blaster or AT Acetone(be careful it will explode).
Use a ""new sharp high quality phillips screwdriver"" ,,press down firmly and lighly tap the screwdriver with a hammer with slight turning pressure,,,to pop the ""delicate"" phillips screws out.
If they don't pop easily, heat ,briefly, the screw heads with propane touch.
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If you can't do this mail me the TB and I'll do it for you.

dave h.
'89 Raider V6 5spd;Aisin Hubs;; Gen2 LS: frt. brakes, rear coils;U.C.arms;R.trailing arms;idler arm; rear LSD axle w.disc brakes ;2 battery system for Dog's fan; relocated ECU; custom bumpers;J.Baker receiver;Conferr roofrack; t-bar crank.