2001 7.3 auto. I was racing one of my friends 6.4 I lost... it was a massacre.. anyway thats not what im worried about. Ive notices that when the truck shifts especially when i believe its shifting to the last gear i lose all boost and it takes forever to accelerate. Is this what people are talking about as de-fuling? Its really frustrating and only happens in WOT if i feather the trottle and let it shift then hammer down i dont lose boost. Any thoughts? also the turbo surges when it does it and until i gain more boost. (probably getting the WW2) for that.