Mine does it also, but only on the first press of the throttle. I always assume it's the electronic throttle control calibrating itself. If you notice, you can always pop down the gas for just a split second while creeping along in say a parking lot or deck, and nothing will really happen apart from maybe a little rev or lurch if you really push it. But a quick jab at of does next to nothing. There's always a bit of delay in the throttle. What do you think?