Low Revolutions Isuzu Trooper 96 3.2

Good day, because I am new in this forum and because I present myself hehe
my name, which I hope to be accepted in this heheje and what I can help here I am for anything hehe

I have an isuzu trooper 96 engine 3.2, is equal to that of the rodeo, the first problem I have is that in the morning or sometimes it is not necessary that it is in the morning When you get on if I release the accelerator, it immediately turns off, if you accelerate, the car is maintained, I clarify this is on occasions, sometimes the car turns correctly to about 1500 rpm being cold and the revolutions are lowered when it is heated.

Another problem that I have is that the car is already hot instead of being at 1000 rpm is approximately 500 rpm, which I have been reading and they say that this is part of the IAC valve, already remove it and disarmed it and wash it with a spay for carburetor, I put it again and put it back in the car, I have looked that they fit but I do not know how to do it, if I remove it, I Switch is triggered the rum (disarm).

The other doubt that I have, my trooper just repaired the entire engine (rings, seeing metals, bench, water pump, valve rubber, the whole engine was really disarmed, after having made that repair I feel that the car is consuming me much more gasoline, imagine that it was a sensor, which takes away a spark plug if it was black If it is why the engine is very tight or knows

. (I don't know if someone knows how it is connected and I could tell me please

I change the gasoline filter and scan the car and I get the errors of the images that I add next

if someone could help me I would be appreciated as noi they have an idea and thank you very much for everything !!!!