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Yes, it's possible that the injector(s) just has dirt in it. Run some good injection cleaner, like Techron or Redline SL-1, through the system; Give the cleaner about a week or two to do it's job.
There is also a product called BG products 44K. It is however a very strong cleaner and in some cases it has worsened fuel injection operation; it has a tendency to attack the internal non-metallic parts of a fuel injector.
Also, you may have leaking fuel injectors. To test them, unbolt the fuel rail from the intake manifold and pull off the entire assembly. Keep the fuel hoses still connected and don't remove any individual injectors. Also keep the electrical connectors on the injectors. With the assembly now away from the intake, turn the ignition key to the run position WITHOUT STARTING THE ENGINE. Now observe each injector to look for leaks. There should be no drips.
Make sure you have at least 4 spare insulator rings for the injectors in case some are damaged during rail removal.
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