Last Tuesday night was that super cold night (-25). My 2009 2.5L Legacy wagon started running rough, then the CEL and cruise control light came on.
Towed the car to Subaru. They said the CEL threw a misfire in 3 and 4, and changed the plugs. No dice. Then they cleaned the PCV. Thought the problem was solved, but it started misfiring again.
They've tried to make the problem happen again for the last 4 days, and it hasn't misfired again. So they gave the car back to us, saying they couldn't replicate the problem, so there's nothing else they can do.
I'm wondering if I could rely on your knowledge to maybe give me some ideas. There is that famous thread on clubwrx.net that says to clean the MAF . . . so I'll try that . . . but don't know if I can trust this car anymore if this could happen at any time.
Thanks in advance for your thoughts.