Sorry itÆs taken so long to get back to this, but IÆve been busy. I think IÆve traced the idle problem to a leak in the AS Reed Valve (aka PAIR Valve), but IÆm not 100% sure. Does anyone know if this part can be tested without taking it off the engine? IÆm pretty sure IÆd have to bust the nuts off of the manifold to get it off. I checked and cleaned the TPS again and spent a lot of time moving it micrometers one way or the other to get all of the settings as close to the middle of the range as possible. I checked the throttle body again and couldnÆt find anything out of whack. Same for the air intake. Checked all the plugs and wires and theyÆre fine. CouldnÆt find any other vacuum leaks. Plan to replace the cap & rotor this weekend. (FYI one of the local dealers has one (1) Factory Repair Manual left for the Æ89 4Runner û only $30. See http://www.longmonttoyota.com/ for contact info.) I may try to do the brake light / ECU bypass just to avoid any future problems. Anyone ever tried bypassing the ~1500 rpm fuel cut itself?