Sounds like similar problem i had, possible air lock in the fuel system ?

Start the car with the fuel pump relay bridged, ignition on, hold the metering flap down and start it up.....let it run for a while, and clear itself, once its been running ok, turn off....connect fuel relay back up as normal....and then try again with just the ignition and leave everything else....worked for me....

Only problem was 10 mins later my fuel pump died and now i need a new one lol