I believe its my IAC acting up just need conformation on it. Lately my druck has developed an very odd idle. Some days it will idle fine then others like just now it will start to idle fine then it stumbles for a split second picks itself back up. I notice it does fine on warmer days but the weather is cooler now in Florida and that's when I notice the stumble.

 

Yeah it sounds like it... try unplugging it and seeing what happens.