My 97 honda accord will sporatically shut off while driving and it has trouble starting as well. I recently replaced the battery (last fall). Some days, it will die a few times, others it will run just fine, I haven't found any pattern in what could be causing it. I took it to a mechanic today and they said they couldn't find anything. Any one else have an idea of what it could be?

Replace the Ignition Control Module (ICM) and coil:

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