i cant believe no one recommended this but an easier way to check a injector with out having to unplug this and that is a screwdriver. You just take a long screwdriver place the metal end of it on the back of the injector wrap you hand around the grip in a matter so that you can put you ear up to it and listen to the injector. a good injector will sound like several clicks and you sould be able to hear it very clearly. anything other sounds can indicate a weak injector and no sound indicates a dead injector.
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