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There are seals on both sides of the injector.
On the fuel rail side, there are 'O'-rings.
On the intake manifold side, there are "seat seals."
Did you replace the seals on both sides?
Is the leak occuring on the fuel rail side of the injector, or the intake manifold side?
Which injector is this? On number one cylinder? Number five? Something else?
If you swap the injector to a different cylinder, does the problem move?
Does the spark plug on this cylinder look "coked-up" compaired to the other cylinders?
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