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There's three different plugs down there, they all look the same but one is keyed differently.
The brown plug is the IACV (although they called it the AAC, Auxilliary Air Control or something on the RB25).
The purple plug is something else, forgot, it's been years since I built my Rb25. I didn't wire it in on any of the RB harnesses I've built.
The black plug is a coolant flow control valve, most people don't use it. If that's what's not plugged in, don't worry abou tit.
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