huh? please explain better did you want to turn off auto stop? turn off AFM??
if you're able to do it your self you could swap a normal engine into it but it's going to be a lot of work.... you will also need to swap the A/C components as well.... pretty much you would be better off getting a 4.8L tahoe and swapping the body components to it.. i.e the hood ,bumper, tailgate stuff...
the 4.8 should get about 20-22mpg with the better aero components with a 6 speed
Just disconnect the hood sensor cable (don't cut it)... this will turn off auto stop and disable remote start as well.