I have a 1991 honda accord ex that won't start all the time. I changed the plugs wires cap and router, fuel pump. It will crank and crank but won't turn over. Then if I let it sit for about 30 min it turn over and run great any ideas

. 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

. Repair or replace the main relay, if the problem persists and it seems to be related to higher daytime temperatures in the afternoon.