RPM surging when at idle

What is your question?

Whenever I am at a stop light or stop sign and I'm at idle. My RPM will drop to below 500 then jump up to 800 or 900. And this will continue over and over until I start moving forward. I've noticed that if I turn of the AC it will help most of the time. And sometimes it helps if I put it in park. And if I have it in park with the AC off, no surging down and up. So does it have something to do with the AC?

What makes this problem better or worse?

When I turn off the AC, it helps most of the time

How long has your 2015 Mitsubishi Outlander Sport had this problem?

A few weeks