chucksfc

don't know how to delete a post.

My Rx300 has exact same problem, so I got read the forum and took out the 2 air intake hoses and the IACV locates right under them. I took out the two screws and cleaned the inside with the throttle body cleaner. The problem went away, so here is the pictures I took (IACV is the black piece with the two screws, one of them has the yellow dot on it).

Hope this help somebody in the future.

Had the same problem, followed your procedure and it has worked great since. Thanks for the tip!

Just an obvious warning - I hosed out the throttle body itself as well (it was pretty grimy) with a lot of cleaner. When I reassembled and went to start the car, it hydrolocked. I waited about a half hour and I guess the remaining throttle body cleaner evaporated. Another obvious warning (apparently I am an idiot)- Be careful when hosing out the solenoid and throttle body as the vapors and cleaner get redirected basically into your face through the throttle body itself. That is some nasty stuff.