I plugged in all my electrical connections since the motor swap & I have one connector I have no idea where it belongs. It is on the drivers side harness with all the coil & injector wires, at the end (front of the motor). I recall another similar post in the past & searched. What I found is that it may be for the air filter sensor. If so, it is no longer being used since the car has a Procharger. I have attached a picture. Any would be greatly appreciated. Thanks.