Well first off, Thanks Black02SS (Chad) for poining me in the right direction earlier today. I have been battling rpm "hunting" problems for a while on a buddies truck now for a while, a 408 Silverado. I have been searching around a lot on here and found tons of helpful advice an tuning various things like idle timing, Learned Airflow tables, Desired Airlow, etc. and monitoring the correct pids. What Chad showed me today though took me 180 degrees from where I was goin with the tune. The truck started right up, idled great, all was well until you would start slowing down and then the surging and bucking would progressivly get worse till at a complete stop. As it turns out, all it too was a little more desired airflow and changing the Throttle cracker activate/deactivate speed and just like that its all good. Thanks again for the help and I hope my experience will be valuable to someone in the future!