Nissan Almera N15 problem

Hello, I'm new to the forum and I don't know much of mechanics, but I really want to learn.
I have a Nissan Almera 1.6 GX, from 1997, I have it very recently, but I have noticed that during the mornings when I go to my work, the car works very accelerated, I stop at traffic lights and do not maintain its very high revolutions.

I don't know what could be, I have been told several things, but I haven't put hand yet.

I hope help and greetings!