2009 honda civic si stalling?

I just bought this car about 2 months ago and it's been fine with air conditioning but up until a few days ago it's been stalling when the air conditionings on. Any ideas?

Get it looked at by a garage it will cost you a fair bit but your car should be running smoothly after that. Happy to help.

Idle Air Control (IAC) module

Is the CEL on? Any code? You can get the code read at your local Advance or Auto Zone auto part stores if you're living in the States.

Any vacuum leak? The Throttle Body (TB) probably need cleaning, the same thing with the IACV (Idle Air Control Valve). The idle is control by the PCM and should maintain when there's extra load is added like the AC is on. Does the AC compressor engaging good?

Read this article, it'll show you a good deal about the car including cleaning the TB or the IACV:
http://www.civicforums.com/forums/115-engine/309151-diy-forgotten-tune-up-mods.html