in progress of my wrx engine in a turbo 2000,

question one, got a random plu ended plug similar to an injector plug on the loom approx 2 inches away from no 2 n no 4 injector plugs, ne one know wat it is??? ac dryer bottle plug??? loom is a 99,

question two, coilpack position!! does this needed earthed?? as i may have moved it lol

stuart