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Dont think the cats have ever been changed, but I doubt its them since its only intermittent. The problem happens within the first 15 minutes of driving, after it warms up, it seems fine. The fuel filter has been changed recently, this didnt help. I also changed the plugs, and they old ones looked very good, nice brownish color, no oil burning or over-lean seeming condition. I'm not sure about the MAF or O2's, I havent changed them. I have cleaned the MAF though.
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