Does the car sound like a Subaru when it's running?

One quick way to check and see if your injector is working is to take a long flathead screwdriver or a 12" ratchet extension and put the tip right onto the injector body and put your ear up against the screwdriver handle or the extension. If the injector is working you should hear a fast metallic clicking sound. TO make sure you know wha to listen for try doing this on a friends car that you know works or try it on of of the cylinders on your car that does work. If the injector is not making any noise, then check the wiring first before you go and replace the injector. Hopefully you have a multimeter so you can test the wiring, if not buy one like an Actron from Autozone. Let me know if you need the steps out of the service manual that tells you how to check the wiring.