Motor does not return to minima march

Hello and greetings to all ... well .. my problem is the sig. It is with a Nissan Hardbody 89 with Z24 engine injected TBI and 8 spark plugs .. The prob is that there are times when the engine does not return to minimal march more than everything when for a long time it has moved to the same speed. And sometimes it is also given that when falling as a minimum march it goes out. It doesn't cost to start. but that should not happen eh..grade your help ... some may say that it is the cable ... it is the most logical to get stuck ... but no .... I already check the cable and lubricate it ... and the problem always persists ....

To which it is not because it is not the lack of fuel, there is something covered in the fuel part

Rebis
Tenpepent Sensor
IAC VALVE
Speed ​​Sensor
These censors are linked to your problem

To tell the truth ... that's why I publish my prob..porq already treat all that ... and follow the prob ... but the same ... thanks for interest in my problem ...

You say that it does not return to minimum march or resenti, if this problem occurs, it must be manifested as a breakdown in the ECCS Control Unit, if you do not have problems in the fuel feed system, check the resistance of the position of the position of the acceleration butterfly, and the operation of the IAA and AAC valve, which are responsible for maintain