I installed a new 40 over 350 in my truck. I also installed a Holley 670 cfm throttle body, MSD ignition, MSD distributer all brand new. I replaced all sensors, installed a new thermastat and my truck still has a very small idle surge and stumblesjust a bit when you first lay the foot down. This truck also has a new ECM. I blocked off the egr valve with a plate so it is not a problem. Also this truck has no cat, and all smog stuff has been removed. All that I want to do is get rid of the dead spot. Do I need to have a new PROM made perhaps? Or is this just as good as it is going to get? Any ideas?