Hi new to the group, I just finished swapping in a 6.2 in my 2011 Yukon xl. The 6.2 came with the pcm so I copied all of the engine info over to the 5.3 pcm. Truck idles and drives ok but if you start to give it some throttle it goes into reduced power mode. This happens way before WOT. I have read a few posts of people with the same problem but no real solutions other that someone modified the tune. I am using a friends tuner so I can't see any example tunes from people on the repository who have had success. Can someone send a successful tune or let me know where I went wrong?