engine studdering and rough idle

ive been having this problem for a couple of months now. but i notice now when i use the ac the motor stalls, and if i continue to run the motor it eventally wont idle. any ideas?

 

Is the CEL coming on? If so, have you gotten the codes?

 

Have a place check your battery. Also your alternator may be failing.
But likely your battery is just going to shat and won't hold a good enough charge to help the alt with the power that the AC uses