I am no professional mechanic, however I would also check the output of the O2 sensor.. If the sensor thinks it is hot, or if the computer thinks it is already hot (possibly a temp switch/sensor) it will take the improper readings and try to get the engine to run until it does get hot and the readings are correct. I would also check to see if there is possibly a "cold start" injector that is or was supposed to be with the system.