i had the EXACT same problem happen to me several weeks ago. it had rained earlier in the day and i was flooring it at just about every stop sign. at the last stop sign i pressed on the gas pedal and nothing, pressed in further and nothing, no spongy resistance. pressed all the way in and finally got a burst of speed. got to the burger place, parked it, and waited about 15 minutes. turned it back on and everything was fine. i think this was my cars way of letting me know it doesn't liked being hooned :S