I have a 2004 Jeep grand Cherokee limited with the 4.0. I’m having an issue where and when I turn the air on the RPM drops to 500 or less when I come to a stop. I’ve replaced just about everything IAC, etc and my throttle body is sparkling clean. Bit the bullet and took it in and they couldn’t figure it out as there are no lights on the dash. Compressor seems fine as it doesn’t drop at every stop and does it when it’s off but more so when on. When I start it sometimes it acts like it wants to die. Please help!!