Dysmes

Think I found what I need here Great site for legacy owners http://www.surrealmirage.com/subaru/subaru.html

I just purchashed a 91 legacy LS ej25. I was looking at the wiring harness under the steering colum and noticed a few plugs that were discconected, after i re-connected the ones that had matches the check engine light is now blinking steadly at aprox. a 2 sec interval. Anyone know what this is due to? and how might I be able to make it stop. Thanks for all replys. JS