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No there is nothing that changes the voltage at the injectors. They receive whatever battery voltage there is. It's just a coil that opens and closes the injector. The more often the injector is opened is what determines how much fuel they deliver.
I found a good way to clean injectors by soaking them in carb cleaner, then installing them in a rail with the return line capped off and the supply line gets pressurized with an air compressor. I then fill the rail with carb cleaner then pressurize the rail and pulse the injectors on and off. This will let you see the spray pattern and clean out any gunk.
You can test the injectors without completely removing them from the engine. To do this you have to pull the rail from the block, jumper the f/p to ground in the diagnostic area, and trigger the injectors manually with 12v. Look for fuel and watch the spray pattern.
How much boost are you running? Mods? Any other symtoms? Strange idle, overly rich or anything else? Studdering could be a several things unrelated to the injectors, or fuel system entirely. Could be ignition breakup caused by plugs, coils, wires etc.
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