Mine started doing this after getting the new recall software update. It also only happens after the car is warmed up.
Example: I start the car, drive to get coffee, order and come back within 5-10 minutes, start the car and the revs will jump up and down for a second or two until it settles...
I wouldn't recommend AutoNation Toyota Cerritos. Scheduled an appointment and when I arrived they made me wait 30 minutes before telling me their Supra tech took the day off and I had to reschedule.
Thank you for making me waste my PTO. :thumbsup: