Unstable hot spring Nissan Terrano D22

Well friends, in my workplace we have a Nissan Terrano D22 2.5 Turbo diesel, and it turns out that in cold the engine starts super well with a super stable slowdown, but when the engine takes temperature, the release is very unstable. Someone has some data that can give me to know where the fault is going, the system does not mark Check Engine.

Thank you

Help !!!

Realisa a cleaning of the admission body, and the control of the relay, Czech that does not exstate air leaks in the admission system, that to start, beware of the check theme because on the occasion the bad operations of the sensors do not mark them out of range and that, now you will have to check the flow of the same if it takes it,