Problem with Gear Shifts

Hi brothers, I have a 2001 model 206 1.4 xr automatic geared vehicle, I press the accelerator while taking off with my vehicle, the vehicle will be stuck a little in 1 gear, so the car will shout, so it will switch to the second gear with the sound of the plug and started to do this very often when going uphill, for example, stuck in the 1st gear 2 I don't eat it, it goes straight on the road, it passes to 2, what do you think I can do? What is the problem? I am waiting for your help.

Probably the problem seems to be solenoid valves, sir, I need to go to the automatic transmission and connect with a pc.