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Yeah, this isn't going to be a cat problem. If it's fouling up one cylinder, it's either fuel or ignition related. I still call a headgasket, what with the engine being GM's Quad-4. The check engine light shoule come on, though for a serious enough misfire. Either low compression is doing it, and the fuel mixture just isn't igniting, or you have a leaky fuel injector, and that cylinder is running rich. Check compression.
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Generally speaking, if you were to get what you really deserve, you might be unpleasantly surprised.
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