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'm not misfiring. I'm not at Honda paying another $120 just for them to tell me the codes. Anyone else have this issue? What else could it be?

Maybe the spark plugs and ignition wires date back to 2000
15 years old!

Hi old car worn engine what do you expect from a 15 years old car to run like a new one no way and no how.

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