Little background- 03 cobra, mods- VMP TVS, 2.8 pulley, 60lb injectors, budget return fuel system, cattless exhaust, PVC/EGR delete and the usuals. I haven't driven it since the dyno tune back in December. I took it out Friday to get some fuel. When you first start it up idles fine, when you drive it, it drives good. If you let it sit and idle for an extended amount of time after you drive it, the idle surges between 600-830 ? I have cleaned the IAC and nothing changes. I also noticed the fuel pressure on my areoforce usually stays around 50.2 at idle but after driving for awhile it will idle around 49.3ish? Also, when i start it and let it idle before i drive it, it will idle fine, it just does it after you drive it? Any advice or suggestions wiould be greatly appreciated.