Citroen Xantia does not accelerate me

I have a Citroen Xantia 1.9 Turbo Diesel of 99 in which a problem appears intermittently. When I ask you to go first with joy, I notice that the car does not accelerate and I have to give it several stomps to answer, if I reduce with the gearbox, when I step on the accelerator again sometimes the same thing happens to me, this problem appears especially with a hot engine and when I use it very continuously. When I have several days, at the beginning the car behaves normally.
I don't know what to look at, I have reviewed everything and I don't give it. Please can anyone give me a orientation?
Thank you.

Hello, first look at the flow (cleanse and also if you have the manual measure the endurance resistance) the gas filter. A greeting.

Check the diesel filter, the cartridge sometimes is pensions and gives that symptom.