Out of curiosity, every time you changed the oil, did you use a new crush washer?
Davicho: LOL. Brings me back memories of when I took apart the TB on my 2008 Yaris, s*** was so easy I expected more of a challenge but instead of a 1000 piece jigsaw puzzle it was more like a Duplo block set. You couldn't get it wrong, it was like 5 big parts. My point is, after the TB cleaning, I started driving it, day in and day out, with no problems, until one day the MIL came on. I was like... DOH! Looking around under the hood for something stupid, I found an electrical connector was not connected. So I connected it. Next thing I know, I go to start her up, she sounded like a 1960's lawnmower running on fumes. It coughed and sputtered, then shut off. I gave it a rest. Tried to start her up again. This time she ran a bit longer, but still coughed and sputtered. I did this restarting thing for about 5 minutes until it finally stayed on and the cough and sputtering died out and it ran smooth again. Just saying, maybe it was an "idle learn." On the Yaris, Toyota went with a single-piece TB valve, it's all one unit with a single 8-pin (or so) connector, if it breaks, you buy a new one. I'm sure many manufacturers do the same thing, single-piece TB valves that are 100% electronic with no [apparent] adjustment. I never had a chance to do clean out the TB on my 5 but I'm sure it's similar, I have to do clean out the TB on my Odyssey, when I press the gas pedal from idle position, I get a notchy or stuck feeling, it's probably build up.