Testing a coilpack

[Tiny Tim]

Is it possible?

Its for a friends Impreza, he's getting a misfire on full boost, but we've tried known working leads, new plugs (correctly gapped) and just wondered if we could test the coilpack as getting a spare to try is proving difficult for one reason or another.

[markey b]

havn't had time to flick thru as i'm heading back to work, so it could be complete tosh, but try this:

http://autorepair.about.com/cs/troubleshooting/l/aa062902f.htm