car stalls when starting

[realor]

When I go to start my car first thing in the morning, it usually takes a couple goes. It usually goes like this

engine turns over a couple times, nearly starts
engine starts, runs for 5 secs then stalls
engine starts, runs for 10 secs then stalls
engine starts and runs fine

its usually only the first start of the day when this happens, from then on its fine used: What could the problem be??? its a series 2 manual ute