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K, forget the cat code first isolate the misfire first. A cat below threshold and misfire could be relate but very rarely. a serious misfire could damage the ceramic material in the pipe.
Do the following as explained in previous steps. Clear code, drive @ steady 55 for 3 miles, make sure the engine experiences a 60* change in temperature. If P0420 comes back, or engine has no get up till about 3000rpm, confirm cat problem by removing the O2 before the cat and retest.
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