I agree with you. LOL And the newer they get, the more complicated.
As far as your problem, if the idle is going up and down, it is likely related to the idle air control valve, (IAC). The IAC is responsible for maintaining the engine idle speed.
Basically, on this vehicle the throttle plate fully closes when your foot is off the throttle. At that point, the engine would stall. However, the IAC allows a metered amount of air to bypass the throttle plate.
If you look below at pic 1, I highlighted the part I'm referring to. Pics 2 and 3 are the diagnostics (very simple). The hardest part is removing the throttle body to access the IAC.
Now, what can happen is this. Carbon can build in the IAC causing a restriction of air. That can cause what you described. If you find there is dirt/carbon that can be causing the issue, try servicing the unit first. Here is a link that shows how it's done:
Let me know if this helps or if you have other questions.
See pics below.
Images (Click to enlarge)
Wednesday, September 15th, 2021 AT 8:36 PM