Mine has been doing something similar letely also. If I stop quickly and then take off again soon, the car briefly acts as though the torque converter is not kicking in right away. I can imagine that the fluid is sloshing to the front and then settling again. However this is pure speculation. I don't even know if that is possible. Of course I have no way to check the fluid level without the 6 Million Dollar Bionic Dipstick. But it doesn't seem to be leaking any that I know of. Has only happened a few times.

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra