Possibly clogged/faulty injector.Strangely enough the plug has soot/oil blackness on it but I just recently changed them. Hopefully something is just wrong with the injector wiring but I’m not super hopeful.
3FE fires injectors in 2 groups of 3. All injectors get a +12 on pin2 (black/green stripe) and are pulsed to ground on pin 1 by the ECU to energize the coils. White/light blue stripe for injectors 1-3 and solid yellow for injectors 4-6. Connector 90980−10720. Pins 82998-12270.