Well, I've replaced about everything and finally got rid of the notorious low end "stumble", "hesitation", whatever it's called. So many things are new including the entire fuel system, ICM, coil, opti, plugs, wires, EGR, intake oil leak fixed, MAF cleaning, ICM/coil spacing, IAT relo, springs, lifters, RRs, (and many more) but 
got rid of it.
Just recently, it's finally gone. It turned out to be an exhaust leak at the manifold - head, and manifold - y-pipe. A bolt had broke at each joint. After new SLP headers/y-pipe/cat, O2 sensors, plugs, wires it runs so much better. There is 0 hesitation from a stop. I was also getting 11 mpg city, and I know I'm getting much better now.
So my suggestion for those who have this problem is to check for exhaust leaks!
got rid of it. Just recently, it's finally gone. It turned out to be an exhaust leak at the manifold - head, and manifold - y-pipe. A bolt had broke at each joint. After new SLP headers/y-pipe/cat, O2 sensors, plugs, wires it runs so much better. There is 0 hesitation from a stop. I was also getting 11 mpg city, and I know I'm getting much better now.
So my suggestion for those who have this problem is to check for exhaust leaks!
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