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#2: 02-08-2013, 07:19 PM
 
 Giffle
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Location: Laval, Québec, Canada
Car: 2001 Legacy "WRX" Wagon
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First, I would check all the spark plugs. The ones closer to the firewall (no 3 and 4) usually tend to wear faster.

It is also possible that the engine need a cleaning treatment. The Terraclean performed by the dealers here in Canada works pretty well to remove carbon deposit.