When an engine starts from cold,it does revs a bit higher than normal and then settle down after a few minutes of warming.This is quite normal.Now when engine is idling and then you start ac,it is quite normal that you will hear a higher noise/sound.This is because the compressor for the ac has activated.
It will idle high with air con on and revs will go up and down try turning air con off it that fixes it then there is no problem
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