Mostly when its hot or warm. I had only changed the trans fliud on my car when now I drive it does not respond how it used too. It seems as thou the car does this mostly when fully warm. If I turn off the car to go to the store and come back out everything seems fine, then again after few minutes same thing like a stall feeeling motion. But if I engage the nuetral gear engine revs with no problem which leads me to believe it has to do with tranny and not the engine. Besides all I did was change the transmission oil. Could someone help me out?