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You can only check the outer o rings of the injectors by checking for visible fuel leaks on fuel rail, the inside ones are the ones u need to check. Connect a fuel pressure gauge and see if it hold pressure, if it doesnt ur o rings are possibly leaking by and fuel is pouring into the engine so that will cause u to run rich, you can verify by pulling fuel rail off with fuel lines connected and turn ignition on, u will see fuel leaking from tip of injectors
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