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Well, after a new EGR valve and coolant sensor, I still had the hesitation problem and it seemed to be getting worse. I rigged up a fuel pressure gauge and hooked it up on the input side of the fuel filter. The gauge indicated that the pump was only building up 3psi and then losing pressure.

I decided to drop the tank and have a look at the fuel pump assembly. When I removed the fuel pump assembly from within the tank, I found that a short 2" piece of rubber hose that connected the fuel pump to the metal fuel line was split and badly deteriated. I replaced the rubber hose with a new piece of fuel line and reinstalled the tank. The truck runs great again.