I have a 1994 honda accord sometimes it starts 2 days later won't start,I checked for codes I get code 15 ignition output. I replace thr distributor and thre main relay.and stiil have the same problem starts and stalls. Thanks for help

You likely replaced the distributor housing and reused your old Ignition Control Module (igniter). I believe if you replace the igniter, your problem will be solved. Here's what it looks like and costs:

Zip Code Entry at PartsAmerica.com (http://www.partsamerica.com/ProductList.aspx?PartType=194&PTSet=A&SearchFor=Ignition+Module%2fControl+Unit)

Here's how to install it yourself:

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

I recommend you replace the coil and rotor at the same time, if you haven't already.