It's been happening intermittently. After making a turn or slowing for a stop light at around 15 to 20 mph, I push the throttle lightly to resume acceleration and the car shakes for a couple of seconds and then returns to normal. It happen only when the car is still warming up and it is very intermittent. Changing the trans fluid helped but it starting to happen again. Does this sound like the torque converter? The car has 31k miles now. Trans service has been done by the dealership.