I have the 4.71 Edge box on my 03 GMC Dura/Alli, I can only get half throttle(if that) now without it defueling. What gives? This is dangerous, I went to pass a few nights ago and it defueled so bad I had to jump on the brakes and pull back in. How does the Attitude work with the defueling, does it really work? This is definetly learned behavior, it's gotten worse over time. The rest of the truck is great.