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Can you have clogged cats without a check engine light?

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Old 02-21-2013, 09:09 PM
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Good luck with it man... I know how much of a PITA it is.
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Old 02-21-2013, 09:23 PM
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Yeah Idk if its the cats or the champion plugs. Truck runs great except at wide open throttle
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Old 02-21-2013, 09:32 PM
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Exactly how mine was too... WOT in park was strong too... only under a load when the truck was having to burn more fuel/pass more exhaust is when it would putt along like a 4 banger
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