I just replaced my battery today well now once I turn on my air conditioner my car starts to lose power and even shuts off. What could be the problem?
The throttle body is dirty. Over time, the PCM compensates for this so you never never realize it. When the battery was disconnected, the PCM forgot all about those learned values, and now it is operating as if you had a clean throttle body.
Clean it, then do another battery disconnect and you should be good to go.