If the connector looks like it would go to an extra fuel injector (that's how it looks to me...) it is the Knock Sensor, down on the driver's side oil sump rail. It can be replaced with a repair connector, which should be in the Motormite section (get one that is listed for your fuel injectors - the knock sensor is the same.)
When you replace it, make sure you keep the copper foil going down the harness as far as you can. It's there to shield the wiring from picking up spurious signals and giving "false positives," which will cause performance issues due to retarded timing. If you need to, wrap the new harness connector with aluminum foil, and make sure it touches the copper foil SOLIDLY and DIRECTLY. Most electronics stores will also have copper foil tape, which works well and will be easier to handle.
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Looking at the pic again - you just might need a new sensor instead. Expect it to not look the same, the replacement will probably come with a stud that screws into the hole, and the sensor will be retained on that stud with an included nut. Apart from that, it will work fine.
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