So every once in a while my rig will start to get a sort of "pulsing" idle. It isn't fatal but it obviously isn't right, it will hang around 1k rpm, just above and just below. It almost sounds like a heartbeat if that was possible. Looking for suggestions to what it is! Thanks.

My EJ22 swapped loyale has started to do this sometimes, i am suspect of a dirty IAC but haven't had time to take it off and clean it.