Depends on car since idle speed varies among models but it usually around 750- that would be 12.5 in 1 second.
15 revolution per second 900/60=15 60 seconds in a minute divide by 60 to get number of revolution per second
Is the AC turned on?
you are flooding the engine
Engine miss.
Engine bounce is a phenomenon where the engine speed rises rapidly and then drops back down while the vehicle is idling. This can be caused by issues with the fuel system, ignition system, or engine timing. It can lead to rough idling and poor engine performance.
There can be many reasons why a car surges while idling. Some of these reasons are the computer could be dying, or the fuel injector are giving the engine too much gas.
Trans fluid is always checked with car level and idling while warmed up.
It should be idling at approximately 625 rpm while the engine is warm.
A) It needs to be serviced. B) An animal in your trunk is uneasy when the engine idles.
air leek
It is the idling sensor on top of the intake
get an engine diagnostic check, a lot of different problems can contribute to your situation.