Ford escort 1.9 L ignition

Good I have a problem with the ignition of a Ford Escort 1987 1.9liters with monopunto injection (TBI).
The fault is that when the car turns on, you have to make several attempts to start either cold or hot, however sometimes it starts the first.
What can it be?
If someone has an idea what the fault is, they would appreciate them to help me.