Hello everyone, I have a newbie question for you. I have a neighbor who has a 2001 6.0L with a 4L60e in a jeep wrangler. He had it programmed by another guy and is having some concerns when going from open loop to closed loop, it acts like it is taking fuel away, no throttle response, no power at all. This will last anywhere between 10 seconds to a minute or more. Once it either makes the transition or goes into 'limp', it will run fine until shutting off and going into open loop again. My question is, does the segment swap need to be done to correct this concern?? The story I get from the other tuner is, he used a '99 5.3L/4L60e tune and overwrote the engine files with 6.0 files. I pulled files and didn't see any issues with tuning, but am fairly new to HP Tuners. He wants me to tune it and see if I can fix concerns, any help would be greatly appreciated.