Hesitation on 00 blazer

I have a 00 blazer with 63K on it, I just recently bought the truck used, and am getting pretty flustrated with it. But this is my new problem, at about 3,000 to 3,500 rpm regardless if im fully on the gas, or half on the throttle, the car will start to hesitate really bad. Almost causing like a bucking sensation, however if i keep my foot to the floor, and eventually get past 3500 rpm the truck runs strong. I have gotten a couple of opinions on what it might be.

1. fuel filter
2. plugs & wires
3. crank sensor
4. fuel pump
5. fuel injectors

Any help you guys can offer I would appreciate it.

lost without a clue RACING

Opinions are like butts, everyone has one and they all stink. Here's mine. Testing, not poll taking, solves problems. GM had problems with fuel delivery during this time, but also had problems with O2 sensors, catalytic convertors, and sunroofs. Let's replace them all. Testing will solve problems. Try opening up the exhaust and see if the problem changes. You will be onto something. Testing fuel pressure will also give clues. Ray

good input ray...