I'm posting this for my wife, as she doesn't do this kind of thing. Her 2005 RX330 AWD has had the "hesitation" or whatever it is since we got it. The dealer just lies his head off about what causes it, what they have done to "fix" it and what they will do in the future. I have no confidence in them (Lexus of Dayton - OHIO) at all. Every time it is in the shop, they screw up something else. So far she has gotten a "free" $120.00 oil change, that had the car back in three times to fix what they screwed up. I have read this whole thread and copied the TSB referenced earlier and will take that into them, and ask if it was performed. The problems are secondary to the poor service.