I probably should have mentioned that the truck originally had a 5.2l/318, it now has a 5.9l/360 & will eventually get a stroked version that goes to about 408. It is running on the original 5.2l PCM right now & this seems to be fine as at that time the PCM in the 1500 trucks was the same between the 5.2l & 5.9l engines I just think that it should be able to do better, especially when running down the freeway empty. Like with lean cruise enabled...