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What cause a leaking fuel injector?

1987 chevrolet silverado 5.7L when i turn the key on one of the injector spray fuel into the instake do it suppose to spray fuel when i turn the key on? when i turn the key off i can see fuel dripping from the injector how do i fix this problem?

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I have a 1999 Chevy Suburban that is sometimes hard to start. Most of the time it starts just fine. Then sometimes it acts like it is flooded. After waiting for an hour, it starts right up. Installed new...

Hi there,
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