RPM Fluctuation Shifting into Drive/Reverse
I'm experiencing a dip in RPMs every time I shift out of P/N into D/R. It holds steady at 600 RPM while in idling in drive, but if I apply the brake and shift into reverse the RPMs drop to around 400 but immediately pop back up to 600. The engine doesn't like it, nor do I. It makes a sound like it's being smothered, but only for half a second during the dip.
Has anyone experienced this? Any thoughts on what could be causing this?