Question

No engine light and with the ac on the car loses power when it comes to a stop... what is this

Answer 1

i was having a similar problem. when driving down the road my truck ran fine if i was driving slow or come to stop sign the voltage would drop and the truck would die sometimes. took to chevy and my fuel injectors were dirty and they updated my ECM and i had a bad O2 sensor got it all fixed worked great now

Answer 2

what year is the car? have you ever had any service work done on the a/c system? possibly the compressor pully bearing is worn and causing drag.