if the injector o-rings are bad it will cause the car to run lean? or am i wrong?

 

it'll cause the fuel rail to leak gas

 

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I think he might mean the thicker rings that go from the bottom of the injector to the intake manifold... you can check to see if they are leaking by letting the car warm up, pop the hood, and spray carb cleaner at the injectors listen for a change in the engine. If theres a change you have air passing between the injector and intake manifold.. which is slightly leaning out ur car, but ur cars probably running rich as hell like 90% of sevens with out a SAFC.