Put a new MAF sensor on.
I have been having this surging whenever I come to a complete stop, it lunges when I tap the gas or it goes into WOT for a split second. So much so I have almost gotten in a few accidents. My wife will not and has never driven my Tahoe (in the 7 years I've owned it) because of this and it is extremely nerve racking at times but, I have just gotten used to it. Until now haha, it finally drives normal all because of the new mass air flow sensor. Who woulda thunk.
It's been a long time but I have to say, it is finally nice to drive. Now all I need is a built trans and better stall