Sportage 2000 Automatic Box Problems

Greetings, currently my van presents me: Kia Sportage, automatic, 4x4, to gasoline year 2000.
I have noticed that I had lost strength in the start my truck, so I decided to change spark plugs, gasoline filter, electric gasoline stack, I thought it was nothing serious, because the difference is minimal.
But 2 days ago I came rolling everything well, suddenly soft stops and when I returned they raised the high RPM, almost 5000 rpm and the box did not make the change.
The truck I start in D and responds well at 1st, but if Ruedo upload the rpm and does not change to 2nd, when I apply the retro and everything is fine.
I went around, I put D and the RPM climb up and do not make the change, but squeezed the Hold button and changes normally, of course it does not change to 3rd.
In the mornings in cold it starts well, the retro well, there are no strange noises in the box, apply the normal gentle D and r, if I apply on the lever 2nd or it also grabs it.
Only when I am rolling in D is that it does not make the change, the High rpm uploads unless I pressed the Hold button rolling and makes the change to 2nd without problems.
Before taking the truck to a mechanic I need advice.
I thank you for any help.

Well friend if you say that the truck only presents problems on rolling

I recommend you verify the points:

UD: LOW GUARD 1.2
2nd: second brake

Azlo with a manometro, I also recommend checking the oil level and if you changed it, verify that it is appropriate.