Rough idle, and engine light.

[svxsubaru1]

I just got my svx running with the 5spd, and i have been driving it around with no problems ecept this one. I was driving to the subaru dealer to get a part diagram, I picked up the digarm and went back out to my car, I turned it on rough idle, almost sounds like a miss, and the check engine light came on. I shut it off looked uned the hood, no leaks, no unhooked hoses that i could see, oxegen senors still hooked in. It did it all of a sudden it was running fine then i came back out and tried to turn it on and this happened. I unplugged the ECU and will plug it back in to see if that fixes it. I drove it back home and it ran fine ecept at idle.