Bucks And Snatches Slightly At Low Speed When Cold

[2004AUY85kwTDI]

Hi my galaxy bucks and snatches slightly at low speed when cold.

When driving in 3 gear and 40 km/t the car pulles unevenly, only when the load is low (flat or slightly down hill)

 

I changed my air inlet filter and diesel filter and then it dissapered 100%. This is 6 months ago and now its starts again.

Next time I will change only one filter at the time to be able to specify what filter that made the differens.

Any idea what the problem is?