Please test the engine coolant temperature sensor. I would do this as a frist step. I dont have the specs for your car, you will need a multimeter and will be measuring OHMS (resistance).

This value will change as the engine warms up and signals the system as to the temp of the engine resulting in a richer or leaner fuel mixture and likely activation of the cold start injector as well.

Do a search to find specs, if you are unsure ask a friend that has some experience or see if there is a member near you that can help. Not sure where you are located.

Good luck with it,
Acky