Oil leaking into the spark plug tubs from the rocker covers is a common reason for them to idle rough. Can be fixed very easily, but its often over looked. Just dont let the oil swell the Ignition leads so much that they wont physically hold themselves on the plug anymore.

Apart from really being one of the most undesirable subaru's, They are non bad

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Wand basics:
One must brake with the left hand and steer with the right foot.
Having Defi's does not make Racecar..