2004 Kia Spectra EX (2.0L Engine) - Sputters and Hesitates When Accelerating

I have a 2004 Kia Spectra EX that has begun to sputter and hesitate when I am accelerating, regardless of whether I am accelerating from a standstill or on the highway. It feels like the engine is either not getting enough gas, or that the air/gas mixture is not correct. The car has almost 150,000 miles and we have recently (within last 10,000 miles) changed the spark plugs and air filters. Can anybody tell me where to begin looking? The car, from what I can find, does not have a PCV; otherwise, that would be my first suspicion.

How about the plug wires and or coils? I would think fuel pressure or clogged catalytic converter. Are there any codes. They can be pulled for free at Advanced or Autozone.

What about the fuel filter???