Agreed and I had a similar issue, but mostly when slowing to a stop on a downward slope. However, I did also see it from time to time when going up the driveway at an angle. I would log all TCM parameters ending in "flag" and also log line pressure.I have seen the same issue a few times. I am pretty sure its transmission related, it feels like the transmission was about to downshift to 1st and then when you engage throttle again it delays. Log transmission and ask your tuner. The throttle won't engage until the shift is finished and at slow speeds it takes extra time.