slow motion

I have a Chevrolet Luv Truck Year97 2.3cc Motor Izuzu with Carburetor.
The problem is that when the accelerator is released, the engine stops, does anyone know anything?

It has the needle of the minimum or dirty minimum if you take it the clean blows where then you put it until you reach the end and then you give it two and a half laps to open there it will have the minimum or very accelerated if it puts it tries to turn off if it is accelerated and also goes out they have to place it in the middle of both