It sounds like you're approaching the problem. In the past I've cooked up a homemade single injector cleaner rig using a electrical plug cut from an old harness and a piece of clear hose that fit over the injector fuel inlet. The clear hose was several inches long with a plug in the opposite end that had a hole cut in it to allow spray tip from a can of carb cleaner to slightly pressurize the hose above the fuel inlet. I pulsed the injector using a 9V battery and a proper switch (not bare wires). You could test your injectors individually by momentarily energizing them and listening for the click, but I would use a harness plug on the back of the injector so you don't arc electricity. Do this far away from gasoline vapors or you could have a fire. After opening up the fuel system, I always check for leaks in the copper washer connections by pressurizing the fuel system by jumpering the diagnostic block to hear the fuel flowing without cranking or running the engine. Those copper washers should be replaced every time because they get harder with every tightening and lose their ability to seal. Lubricate the fuel rail rubber O-rings when installing with a drop of gas or mineral oil so they don't tear.
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