ACURA INTEGRA MISFIRE CODE?

I have an all stock 2000 Acura Integra ls. My check engine light came on, had to get a new cat converter. Then I replaced it, it was faulty. Had to buy another $300 one. Then as soon as it was replaced, the random misfire code and misfire in fourth cylinder code came on as well. However, I am not misfiring. I am not at Honda paying another $120 just for them to tell me the codes. Anyone else have this issue? What else could it be?

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