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The connector for the idle up valve under the throttle body is blue too. It plugs into the backside of the valve. It bolts to the manifold with 2 10mm head bolts and has several coolant hoses connected to it along with two larger hoses, one goes to the throttle body on the pass side and the other goes to the intake plenum by the cold start injector.

That valve is refered to as the "Auxiliary Air Valve" in my FSM (AAV). I believe the connector *is* blue as you said.

The "idle up valve" referred to by CJM is referred to as a "vacuum switching valve" in my FSM, & although I'm not 100% sure, I believe it its actuated by the ECU when in 4WD to cut vacuum to the fuel pressure regulator.

Dave