My 91 civic will crank all day but won't start. Has fuel and new spark plugs. I really have no clue on what to do. If anyone can help please post. Thanks

Performing these tests should lead you to the cause:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-2.html#post229012

If the CEL comes on and goes off normaly, the problem is likely distributor related (i.e. Ignition Control Module and coil).