1996 Accent - low rpm hesitation

As I shift gears (5 speed) the car will hesitate/buck as I accelerate until RPM's reach a certain point. At highway speed (high rpm) the car runs fine. I'm not sure if the problem is fuel or spark. It seems to occur more after the car warms up. Any ideas?

This past year I have replaced:

Fuel filter (more than once)
Idle air control valve
Crankshaft Position Sensor
Ignition coil
Plugs and wires
Alternator
Starter

Did you get your can fixed? Mine does the same thing.

what plugs did you guys put in the car?

Nope, problem still exists although it hasn't gotten any worse. Would dirty fuel injectors cause this problem?

I have NGK plugs right now. It's actually been over a year and I'm going to change plugs, wires and fuel filter again just for good measure.

I'm going to try a compression test this weekend. Maybe that will tell me something. I had a guy look at my plugs and he said they looked OK maybe a little lean.

Check engine light finally came on and I read the code. Cylinder 2 misfire. New plugs and wires fixed the problem.

I did that too but it started doing it again.