My 2001 Renault Megane takes to turn on cold

Good morning, I have a problem with my Renault Megame Classicc 2001, when I am going to light it in the morning it takes a world to turn on, and when it does it increases the rpm to more than 1500 and then abruptly they go to zero and turn off, this procedure has been all mornings, until it heats up and manages to stay on, but then when I go to start the car at the time I am able My renault is synchronous, this weekend check the IAC, the injectors, the spark plugs, the coils and everything is not I know what else to do if they know something on the subject you would appreciate it.

You would have to control pressure and fuel flow seems to me that you did not check greetings