If you determine that the injector itself is the problem I think you should try lightly sanding its terminals and spraying the harness connector with WD-40 (then wipe and let dry) before buying a new injector. The connection may just have gotten a little corrosion when it got wet. This is cheap and easy to try.
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Working on cars can either be one of the most frustrating things you ever do in your life, or it can be the most frustrating thing you ever do in your life. | 
