Yesterday I took my car out for a short drive and when I came home I noticed it was idleing a little high. Around 1000 rpm in park. Anyways today I drove a bit more and I noticed that now it is idleing rough in park going up and down from 400 to 800 rpm. I checcked the oil dipstick and it was wayy past the full mark. And when I checked the trans fluid it was almost completely empty. Is it even possible for the trans fluid to do this? The oil itself wasn't murky just dark which I thought was odd since I changed the oil myself 400 miles ago. What could cause this?