Do I need to replace my fuel injectors?

Hello, no, I would stop with assumptions and perform testing needed to determine if there may be possibly another concern here. Is the code a misfire code or an ignition coil code? What is the code, share the information? Ignition specific codes can't possibly be related to fuel injector issues. It could be a coil issue (even a replacement one - did you go to Toyota for the new one?), or could be wiring harness related. If it's a general misfire code, you could have issues related to base engine or cylinder head concerns. Hands on testing is needed; please feel free to respond if you have more information to share including trouble codes.