Stuck injector(s) maybe?

To do a quick check on all your injectors try this: get a long flathead screwdriver. Start the car up and while it is running put the tip of the screwdriver onto the metal part of each injector (not the plastic plug). Now put your ear onto the end of the handle and listen. You're basically using the screwdriver as a stethoscope. If the injector is working normally you will hear a non-stop rapid metallic clicking. That's the sound of the injector solenoid opening and closing really fast. If you dont hear a noise in one of the injectors then something could be wrong with that injector.

Would you happen to know how many miles are on the injectors? are you turbo'ed and running an FMU?