i too have noticed this from time to time, almost like a dead miss.
i here the prime on the fule pump then start up, if i tap the gas pedal.
then it will wiggle a little then clears up, usually when i let it just sit for a min or 2 it is fine,
fuel pumps will die if the car sit's for some time or if you run the really low on gas,
had a supra one time that i let the gas get really low, parked on a hill and it damaged the
fuel pump probably some trash it picked up and clogged the pump, how ever this shouldn't be
the case on these new cars.