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When you turn the bronco on, you can hear air being sucked into the hose though? When you disconnect it while its idling the idle rpm will go up a noticeable amount as well. Please answer kind of urgentI'm just a newbie but that looks more like an electrical connection than a hose to me. The end actually looks like the connector for the coolant temperature sender, but that's just on the other side of the engine on my 2.9 (also a '90). Perhaps it is a plug for another sender, like oil pressure or what have you. Others chime in please!