My R32 Never Starts First Turn Over But Always Starts Rough On The Second

[adam wicks]

So my Nissan skyline r32 never starts first turn over cold but always first second turn over it pretty rough start but always starts none the less. sometimes it starts first time when hot.

When I turn the key I hear my fuel pump turn on (walbro 255)

The motor cranks and I can hear the starter motor turning over but can't hear the engine firing

Any help would be awesome thanks !