Thanks for the input DELCO, like i mentioned before I realize my tune is not dead on by any means. All i know is that this phenomenon was not occuring when running the stock OS / MAF tune. The transitions to commanded AFR were made within 2 frames. Lean spikes did not occur until the throttle was released, opposite of how the COS tune works with the rich spikes when throttle is released. I had planned on getting the road runner to help with tuning the VE table because of just how difficult and time consuming it actually is to hit even 1/3 of those cells by driving around......especially in my area where the traffic is always terrible. Believe it or not, aside from a few stray cells, my BEN MAPS were within +/-.07 through out the majority of my standard driving range of the VE table. I know enough about tuning to see when something is wrong but no where near as much as most of you guys know, which is why i started this thread....maybe if the problem is with GM, then we could put our heads together to come up with a work around. If not, i was hoping like Justin has been mentioning, the enrichment acceleration tables could be added.