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There's a lot that goes into the tuning side that can play a role here. Some cars/setups are much worse than others with the idle fluctuations, but often you can hone it in with precision if you adjust things correctly. Increasing the MAF size/location will have a very significant impact on the values the ECU expects to see at idle. If the tune adjusts the scaling to such a degree that that those are outside of the expected range, you will see severe fluctuations and stalling. You can also get the same exact issue if you overcorrect.
AOS, improperly installed catch cans, loose hoses and all those mechanical things will cause issues, no doubt about that. But if you've exhausted those then that would be the next place to look.
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