Yes the injector could be the problem. But first swap injectors. Figure out which injector that is not firring. Then swap it for one that is working. See if it still continues. If it does you got a wiring problem.

 

I think my injectors are junk as I did a 12 volt light test and they all blinked. Truck sat for 8 months till I could get the money to change transmission. Do you think I could soak injectors in cleaner to clear them up as it acts like they are not closing. While I was checking for voltage at injector plugs, unplugging one at a time truck never ran any different?