prob listed as IAC in your shop manual
its a step motor on a spring, remove the throttlebody, pull out the IAC, dissasemble and clean it with carb cleaner or simplegreen and re-install, if it still does it try a new one
normally they get gummed up with crap and when you slam the throttle closed the motor can’t open up the idle air vent fast enough to stop the car from stalling, when they stick open the rpm’s jump all over etc