Gs300 Hesitation While Driving

[mikesgs300]

Hello, I have a 2001 GS300 and I have been having some issues. While taking off from the stop the car hesitates and sometimes when coming to a stop the car will die. Also recently the cars RPM will lower and raise while driving on the free then back to normal after a couple of seconds. Can anyone help me with a possible fix. I was instructed to change the entire throttle body from lexus. Im also having trouble finding the throttle body assembly for the repair. Thank is anyone can help.

[Trinimd]

Same problem. Doing research as we speak. SOme people say to clean the throttle body.

I have this problem since 2002, and it has gradually worsen.