I believe that goes to your purge solenoid. Look at your picture and follow the knuckle of your index finger. It's pointing to a round device. You will plug your cable into the receiver on the engine side of the solenoid.
Why did you replace everything? By chance are you getting the mass air leak code - P0455? I'm chasing this problem down on my 99 4.0 and am wondering if I need to look at the pump or the canister. . .
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