I kind of wonder if the rev limiter is shutting it down...it almost seems to me you may be getting a little wheel spin and the limiter shuts it down. Once the car gets rolling the wheel spin goes away and the rpm's drop a bit so, it clears up. Have you tried launching it at a lower rpm? Like YR said it almost picks the rear end off the ground and that would cause some wheel spin really fast and, since it comes back real quick it gets traction and, drops rpm slightly. It would be interesting to know what your limiter is set at and, how close your are to that number when it launches. Just my 2 cents...could be way off. Hell, could be your dishwashing detergent...
