Bad Idle when A/C on

NEWBIE here. Just got me a 99gs Clipse. I just turn on the A/C and I get a very bad idle. Almost like its puttering out. Engine light on. Anyone know whats up?

Specs:

-84K, No MODS, Bone stock, Just had a new radiator install.

 

Can anyone help?

 

alright when the ac is off does it idle at 900 - 1k rpm constant? how about when you turn on ac where does it go?

stumbles only when A/C is on ?

Crystal ball say's check your iac motor IDLE AIR CONTROL