When stopping fast, the car will not be able to Move forward or rev. Until trans. Makes a klunking sound and feels like fluid returns.

The Kia has been a blessing in a bad stretch of time, ( career ending job accident, loss of job due to accident, loss of home due to no money, hence we are now homeless so our car is very important to us ) and my 2000 Kia Sephia has been our rock. It has over 140,000 miles on it and I have done all the maintenance on it.I had to stop suddenly to avoid an accident, and after we found out nobody was hurt or smashed I tried to drive away only to realize my car would not move. I shifted gears turned it off, restarted it, shifted gears again, nothing helped. After numerous horns and fingers I figured I needed to move the car out of the street and I opened the door to push the car and after about a foot the car started to move on it's own, I had left the car running and the gearshift in drive. I jumped back in and off we went, and as long as I was careful and did not stop fast it would continue to drive. When I have had to stop quickly it would come back after about thirty seconds or a minute and you could hear, like the fluid return, and driving would return to normal? Please help me figure this out, we need a little good fortune to come our way. Thank you if you can help. Rich T.