I used the diagnostic unit to determine some fault codes. The one that is concerning is code 453. I understand that means there is a misfire on cylinder 3. Would that be a result of a bad fuel injector? I recently had to do an extensive clean and replace on the PCV system which included removing the fuel rail. I didn't replace any of the injectors at the time because I am cheap and this car doesn't mean a lot to me. The fuel injectors came off rusty and obviously warn. Would that likely be the reason for my misfire?

As always thanks for any assistance.
Adam