Just curious, but are iridium plugs suggested for that engine? I would bet no, and what is probably your issue. Iridium plugs are great for turbo'd engines as they resist the heat better, but on n/a engines they can cause problems.
Well my gut was wrong, ngk iridium are Oem with that engine.
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Last edited by ksa8907; 01-23-2013 at 11:43 PM..
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