1998 Nissan Sentra

I have a problem with my car transmission its minor but it annoyes me, if I am taking my car for the first time in the days the transmission takes some time to get the power and run. When I stops at the stop signs and try take of my car takes time to get the power and all of a sudden it jumps front. But if the engine warmed enough like if I drive for 30 minutes this problem disappears. But if the engine is cooled down the problem reapears. May be you can help me with the problem