nissan altima 98 idle problems

hi when i start the car in the morning when the car it's cold and when i turn the ac on the car tries to shut down and the rpm goes down almost to 0 y have the chek engine light on i have change the idle controler but still the same i'll apreciatte us help or maybe a bad part from the dealer it's brand new from nissan

ac compressor could be going bad. take off the belt and see if you can turn it by hand.