1AZ-FSE? Are the turns floating? - There is a solution! — Toyota Avensis, 2.0 liter, 2005

We have overcome this problem. Everything is simply banal.
The throttle valve has a gap through which some air enters the idle. Dirt and deposits accumulate in this gap, reducing it. Accordingly, the car ceases to have enough air and the speed starts to jump.
The solution is to simply remove this soot. You can simply wipe it off with a cloth soaked in some kind of cleaner or aerosol cleaner. We cleaned it like this 2 times, after the second I had to throw off the clamp due to the fact that XX became high.