Fuel injectors

1997 Isuzu Rodeo 3.2 v, 50,000 mi
This vehicle has sat for seven years with fuel in the system. I have replace the fuel pump, tank and in-line filter. I now have good fuel pressure up to the fuel header/injectors but cannot get it to run. I have recently removed the injectors and just as I suspected they are dirty from old fuel. Is there any way to clean and check there operation while out of the vehicle? I would like to bypass the $150.00 ea. Expense of new ones if possible.