I have read a lot of these discussions concerning the IACV on the ES300, 2001 model. I have 115000 miles and having these same issues. Took it to the Lexus dealership and they cleaned it for nothing. Worked 1 good time since I received the car post cleaning. Took vehicle back, Lexus cleaned a 2nd time......but did not help. I asked Lexus, if they removed the IACV and cleaned, they stated no. All the discussions I have read have the valve being removed and cleaned, with successful results. Why doesn't Lexus do this? Is it really that easy to remove? One guy said if you change your oil you could do this job? Lexus quoted 200 labor, 200 part.