you checked the fuel pump pressure and related system components? Have all the new connectors been properly installed and no vacuum leaks, etc? Have you done the 12v ground off when engine off? Did you check if the new injectors Ohm in spec 10 - 14 Ohms? Did you do a static leak check of the injectors in the fuel rail at 50 psi? Before new injectors were there issues with original injectors and poor running? Was the replacement of injectors for preventive maintenance? Were the new style injectors new or rebuilt?
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