Nissan Almera Tino 2.2 Common Rail Failure

Hi: I have a Nissan Almera Tino 2.2 Common Rail 112 hp. From 2004 and when the engine is slowed, it has a failure, although the idle is stable, it has no alterations, the engine heads a lot like a wallet, consumption has also risen, when putting the hand in the escape it shows like a little bit a little. Does no failure with the consult II of Nissan,
can they be the injectors?

It can be a lazy injector, also an air intake at the pump entrance (or at the filter entrance), look at it, even if you do not tell us if it smokes by the escape, if it is cold (heaters), either if it starts well ... greetings !!