Does anyone know where this plug goes? the car is a 87 fiero 2.5L, it comes out of the firewall with a bunch of other wires and splits into this plug and that ground wire. i cant figure it out. Also, can someone send me a link or a photo on how the spark plug wires go and the coils? the whole coil system is off the car and i dont know where the 1-4 2-3 coils go. and while im asking about coils, i have a bunch of them in my garage, not sure which ones work, is there a way to test them (off the car) maybe with a ohm meter and how?
thanks in advance

The plug looks like the one that goes to the fuel pump relay. It's mounted on the wall on the driver's side. The ground connects to the hinge bracket on the same side.

thankyou, thats why i couldnt figure out where it goes. i thought it plugged in somewhere on the engine. and thanks for the pic