1000 rpms give or take. When I modded the throttle body (CFM Technologies kit), I noticed the pintle on the original iac valve seemed a bit loose, but I never actually removed it. I reassembled everything, and it ran great. A week later I replaced the iac valve with the GM unit, and my issues started. Followed all the proper procedures I posted earlier, tried a BWD unit, and now the original is back in with the same issues. Using starting fluid, there doesn't appear to be any vacuum leaks, and the datalog indicates all sensors appear to be working correctly. Fuel pressure is 13.5 psi. Maybe related, but if I disconnect the battery, then go for a drive, the truck feels very powerful with phenomenal throttle response, but as I keep driving over the course of 50 miles or so, the truck begins to feel sluggish and heavy, even though fuel pressure remains constant, and the datalog remains consistant.