Hyundai H1 2000 is an annoying accelerated !!!

Hello, good night I present myself, I am Maxi from Buenos Aires Argentina and I just bought a Hyundai H1 Model 2000 Motor 2.5 TD D4BF Hyundai, the issue is that in the return home I notice that it accelerates a lot when I pressed the pedal and it takes to lower the revolution This lazy average and it may be filtering air according to me, it was also a fast look but it is true when that butterfly moves a little as it accelerates a little and surely when accelerating with a pedal you must open a lot, but well I wanted to know issues about it if someone happened to someone, and if anyone knows what is called that device and if its function is to open the mouth in the air or send the signal to the injector.
Well I hope someone answers me please, greetingsssss

I think you get ready to TPS. Or to the throttle leg, in the injected vehicles any air input after the counter can try a false acceleration, or if the TPS has Chinese loop it can have a bit a bit and be accelerated, the theme is giantly wide to explain yourself completely but if you are more punctual you can gladly answer.