Slight jerk forward if accelerating slowly

Only happens when moving from a complete or rolling stop. If I do not bring the rpm's up to around 2000 quick enough when starting to move, it feels like it has a hard time for a second then kind of jerks forward with kind of a clunk and has full response. It is not during a shift as it happens too soon before the car wants to shift and the rpm's do not drop. Does not happen while moving.