2007 Edge SEL
 
	When I'm idling with the a/c on, the RPM occasionally dips down really low and will sometimes stall. It runs fine as long as I'm driving, it's only when the car is stopped. If it does stall, I can start it right back up. 
 
	I cleaned the throttle body about a year ago (it wasn't even really dirty but I did it anyway) when I replaced the spark plugs. Any ideas on what could be causing the low idle/stall only with the ac?