93 legacy auto, so light came on, its running ok but seems a little off. Plugged in the black connector and turned the key to the on position, got a weird buzzing noise from under dash maybe in engine compartment not sure, the engine light was just stuck in on postion wasn't giving me the codes, turned key off and back on, and it gave me the codes this time with no buzzing. Knock sensor is new, 5k miles tops, The starter has been a little weird it will wait to engage turn key to start and nothing happens for about 2 seconds, then it fires right up. Also if the key is in the on postion before i go to start it i hear some relay cycling under the dash. Im starting to wonder if the ecu is giving up. Any ideas on where to start

You should read this. http://www.surrealmirage.com/subaru/engine.html