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If you think you have a leaky injector, that would be a problem. The engine would run poorly at best.
Only way to confirm is pull them out. If you put each one into a jar, you'd be able to see if one leaked more than the other. You will need to lift up the metering plate to get the pump to run (with the ignition in the run position)
Obviously this is a little dangerous, as you are pumping fuel over your engine. The safer alternative is to remove them entirely, and blow compressed air through them. I have an old fuel line connected to the injector, that I use to get a bit of fuel through the injector during this bench test. At 30-40 psi nothing should flow out. At roughly 50-55 psi the injector should spray a nice fan pattern.
If you don't have a compressor, you are stuck using the fuel pump to pressurize them.
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I did this by lifting the metering plate. They all spray when I lift up and stop when I let it down.
If I were to unplug the AFM and turn key on should the injectors spray or just hold pressure?
Thanks