1993 honda civic si,1.6 engine breaks up at 3500 rpms, o2 sensor and cap and rotor changed

Replace the Ignition Control Module and coil:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-4.html#post265896

I have a 1995 Honda Civic with about 220k miles. When I tried to start the engin today, it sounded like it was turning over, but it never fired up. What are the likely causes of this?

Perform tests, in Honda Sections 1 and 2, below:

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