Why getting misfire in all cylinders?

I had same problem with you and I just ended up having a new cat with an engine module. For me it's a lot cheaper than taking it to the shop.

This link should help:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-11.html#post2028083

Depending on your vehicle, replace the ICM.

Read this:

https://www.askmehelpdesk.com/cars-trucks/when-asking-about-your-vehicle-303903.html

Want to know why my engine is not getting spark in one cylinder?

Why getting misfire in all cylinders

Some causes are either bad plug or fuel injectors not working. In case of steady misfire, isolating your misfiring cylinder is just the first step on diagnosing it.