I have just gone through this mate, get a deep socket and take your spark plugs out. If all goes well its a 45 minute job and if they are fairly blackened, most likley fucked. My problem was fixed after changing them.

Usually only R33 skyline coilpacks fuck them selves alot. Not a very common problem that i know of on a subie.

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Honda Hannspree Edition CBR 600 RR - SOLD
Yamaha FZ1N - Purchased