the cat will rob power big time and i believe it can hit just one cylinder with a miss fire. my sisters truck had a partially plugged cat and she had intermittant miss fires. if you have a welder you can cut it off and try to run it. without the cat you may get an o2 sensor code but if you have your power back and no miss fire then you know you need a cat. if it doesn't fix it you can just weld it back on and either do further diagnosis or just off load it.
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