[AC223]

Hello all,

I've got an '05 STI, I was just at some traffic lights and she started idling at 2000rpm before settling down to 1500rpm. Then the engine management light came on. Limped back home and it sounded like it was misfiring a little and running lumpy. I don't have any diagnostics kit here, i'm wondering if this is a common problem and an easy fix I can do myself before handing over a bunch of cash. Any ideas would be much appreciated.

Cheers,
Andy