Yesterday I was trying to find a vacuum leak in my car by spraying carb cleaner here and there. but before i did that I revved my motor by pulling on the cable and heard a loud hovering noise after i let go the cable and when the idle is dropping.
I was wondering is this normal?
My car has been having idle problems for a while now. Everytime i tap on the gas or come to a stop the idle drops very low and seems to want to bogg out.

motor is a jdm b20b