93 Honda civic won't start

I have an odd issue with my 93 honda civic. It will not start in hot or cold weather. If it is 80-85 or hotter it will not start. Or if it is about 20 or less it will also not start. The engine turns over in both cases but will not fire. Battery and altenator are new, would spark plugs cause this? In the hot weather sometimes when I come back to the car after about 10-20 minutes of intitally trying to start it will fire right up. Aside from this the car is great and hope to get another 180K out of her. Any ideas?

Any time I see a mid 80’s or 90’s Honda that won’t start, and the condition is dependent on the weather, my first suspect is the main relay.

Betcha it’s that.