Was driving my accord down the road at 55mph when it just shut down like somebody turned off the key. Coasted to a stop, waited 5 min. the car started right up. Back on the road a mile down at same speed the same thing happens. Pulled over and again waited a few minutes, can started and idled fine. Called a tow. What could this be

Perform the tests outlined in Sections A and B below:

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

Be sure to check for codes. Also, run the K-Test on the ECM at a number of different times, since you may have intermittent ECM failure. If the ECM consistently passes the K-Test, replacing the main relay, Ignition Control Module (ICM), and coil will likely solve the problem and restore "like new" reliability and performance. These are all problematic components on Hondas.

Should you decide to replace the ICM and coil, here's how to do the work yourself:

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