The ECM was put back to stock before reflash, I tried another stock ECM and even swapped out the FICM all with no change. Probably is plugged injectors which I considered early on, but would have thought that would have some other symptoms besides just low power. It sorta makes sense as it is totally non responsive stone cold when fuel is heavier and gets better as the fuel heats up and thins out. I may pull 1 or 2 injector lines to see if I can see any visible crud in them. I'm just afraid of opening a can of worms by doing that.