1990 Honda Accord EX Starting Problem

Need some advice, I'm the original owner of this 1990 Honda Accord. It has 153,000 on it and when it runs it runs great. Well maintained.

My problem is that it starts hard from time to time. Engine trurns good but just won't start right off. sounds like fuel or spark? It eventually will start and run great.

I changed the plugs, fuel filter and the igniter was changed several month ago when it just stopped.

I'm trying to develop a pattern to the problem ie, when it happens like fuel level, temp. etc

Appreciate your help.

Thanks,

Carl Cioppa