The o2 sensor will be changed out today, how do I go about checking the fuel injector filters, out of the 28 cars I've owned I've never had to mess with fuel rails/injectors, so that is new to me!

Parts replaced in the last 8 months:
Fuel Pump
Fuel Filter
NGK Spark Plugs
Standard 7mm Wires

Parts not replaced in the past 8-12 months since I've owned it:
Distributor Cap Rotor Button
Fuel Rail/Injectors
ATCV
TPC

Keep in mind my sohc non vtec zc swap only has 82k miles on it & the car is used for DD. Getting it resolved is a concern because I hate driving it like this!