AFM disabled without reprogramming the PCM
The Range AFM disable device arrived very nicely packaged. Installation is simply plugging the device into your ODB II port. The off-idle stumble completely went away and the instant MPG display confirms that the Suburban is now running on all 8 cylinders, all the time. Gas mileage did not change at all in the past week. The only oddity is the bright blue LED that shines into the floor. It is not noticeable at all during the day, and I started to ignore it after a couple of days.