i have searched through the idle-up topics here but didn't find the answer i really need.

ano po ba talaga ang correct setting ng idle up? sakin kase pag nag on ang a/, tumataas yung rpm ko ng about half a centimeter to a point that i can really feel the jerking at kapag nakastop, ramdam yung sudden vibration pag on ng compressor. ok lang ba ito? or dapat d nagbabago yung rpm kapag nag on ang a/c for as long as it will no go down (otherwise defeating the purpose of the idle-up mechanism)

TIA