Hey guys, my Silverado (in sig) has always had about a half-a-second hesitation whenever I hit the throttle harshly. I say hesitation, but actually it falls on it's face a little and then the rpm shoots up as it should.
My afr's are pretty well dialed in across the board (olsd), and it doesn't just do it from idle, for example it can be humming along at 3,000 rpm and then you whack the throttle, and it falls asleep for a split second before it roars to life.
Sorry, I don't have my wideband hooked up in this scan.