92 Accord won't start but will run
 

I have a strange starting problem on a 92 Accord. When I try to start
it it cranks just fine but refuses to start as if the fuel or ignition
system is off. However sometimes while trying to start it it randomly
will stumble(fire as if it had a lot of drag) and then it will run fine
without skipping or stalling.
I have already fixed the fuel pump relay and can see that gas is
reaching the injectors okay. I'm wondering what actually changes
between 'starting' and 'running' that may cause this problem. If I let
the car warm up then stop it, it will usually start after cranking for
5-6 seconds.


Thanks