5.4l 3v - ac on runs smooth - ac off dropping rpm

Sitting in drive, ac on - runs smooth.

Sitting in drive, ac off - drops and recovers ~50rpm

Sitting in park ac on or off good idle.

It. Seems if Im in drive or reverse the idle is just above 500?

I have an obd2 scanner with live data (basic) and I find it weird that adding a little load makes her run great.

Was thinking of removing fuse for ac compressor as a next step.