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Normally when a catalytic converter goes bad, it fills up with junk. It simply slows down the vehicle. You have the gas pedal to the floor and you are going a lot slower than you should be going. It does not make the vehicle buck. How long has it been since you cleaned out the fuel system? How is your electrical system? How are your plugs? Have they been checked in 8 years?

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Q: How can you tell if the catalytic converter is bad on a 2002 Ford F-350 5.4 engine the truck is bucking?
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