While I get the sense that you want to figure this out quickly, these
"noid" lights are the cheapest way (available on e-bay for $5-10) to see if all the wires at the injectors are getting the correct signal (
i.e., determine if the lack of spray is due to the ECM/wiring or the injectors). Perhaps they are available at your local auto parts store.
BTW, I had to rap on my injectors pretty solidly before the one started spraying.
Good luck,
Mark