I just joined this site, i'm not a mechanic by any means but like to do my own work on my vehicle. I've been having an issue with my 2002 v6 mustang. Everytime I turn on my AC or heater the RPMs will drop way down and the car acts like it wants to die, then it'll idle back up. It does this everytime I stop or put the car in park. As long as the heater and ac are not running the car runs great. Has anyone had this problem before or have any clue what it would be? I cleaned my MAF sensor but nothing changed.