Before someone says it, I did see the misfire thread. :-)
I have a 2002 WRX and it has basically been misfiring since I bought it last year. A recent visit to the dealership led to their telling me that Cylinder 3 and 4 are misfiring. They assured me that it was a bad MAF and o2 sensor. I replaced both and it ran like a new car for half a day.
Now, according to my newfangled OBD2 reader, just cylinder 3 is misfiring. Hoping this is progress.
I'm happy to start buying sparkplugs etc and work through that misfire thread list, BUT I'd like to do it methodically and minimize my cost in buying new parts I don't need. Where should I start in diagnosing cylinder 3?