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Make sure you have good compression on all cylinders, and that the spark plugs are good. Be sure to eliminate anything else that would cause a misfire before you suspect an injector.
A 'fuel injector' fault code would only be set if there was an electrical short circuit or open circuit, whether that be the injector itself or the wiring. The ECM cannot physically see the injector, nor can it know if it's blocked, hosing, or stuck open. So this means that a fault code that says Fuel Injector does not necessarily mean the injector is the fault.
Although it can happen, petrol fuel injectors rarely go electrically faulty. They are pretty reliable in that respect. You can test the injector coil by measuring its resistance with a multimeter. Compare the reading with a known good one. If they are about the same then it's highly likely it's not at fault. DO NOT TEST A DIESEL FUEL INJECTOR THIS WAY. Leave that to the experts.
More likely is a poor connection or a broken wire between the injector and the ECM, and in a worst case a faulty injector driver within the ECM.
The wiring can easily be tested with a noid lamp inserted into the injector plug. A flashing noid lamp when the engine is running indicates the wiring and ECM are good. Use the noid lamp to compare the injector wiring on the cylinder that's not firing with one that is.
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