^This is good advice. I was initially disappointed with the 5.3. It did feel gutless compared to the 5.7 vortec I had back in '97 - that truck was a beast and a blast to drive. I finally sprung for a Diablo tuner for my new 5.3 and it feels like a different truck now, lots of power and even gained a little mpg. I guess they're just tuned too conservative from the factory. I also turned off the AFM (turns off 4 cylinders when cruising, supposedly to save mpg's). That particular feature has been found to burn oil and crap up the inside of the engine after about 90k. Plus it seems to hesitate when you step on it and it has to turn those other cylinders back on.
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