Starting Issues, Engine is cranking and sometimes firing (when cold) Options

[PolliS_5S-FE]

Hi guys. Just wondering if anyone can help shed some light on the subject.

94 'gt has done 250,000kms. Lately it has been really hard to start after its been sitting for a while, usually overnight. The coil, spark plugs, dizzy cap and rotor i just replaced.

What happens is i'll turn the key, engine cranks then nothing. cranks again revs go to 100 - 200 for half a sec then stops, crank again nothing, crank again engine will run very rough at between 300 - 800 revs for about 3 to 5 secs then either come to life and run sweet or die again (but will start properly the next time I crank) i've put some injector cleaner through and theres no fuel that I can see sitting in the spark plug wells, so i'm thinking fuel pump or fuel pressure regulator...?? The only thing that leads me to not thinking its the fuel pump is that it runs fine after the hard start.

[PolliS_5S-FE]

its really strange, when its stuttering after a cold startup (when it finally does) theres no throttle reponse until it runs properly, after the 3 - 5 secs that its stuttering