hi everyone I've just bought a freelander 2003 2.0 ltr diesel which seems to have a problem,it's starts fine and runs fine when it's cold ,at about 1700 revs and 2300 it's starts to judder like it missing but after 2300 revs it's fine again, and during this judder period she kicks out a whitish smoke,this is when it's warmed up but while driving you can't really tell it's doing it,I've cleaned the maf sensor which didn't really make a difference,any ideas guys ,and oh just to let you know I'm not that great with cars so please don't confuse me ,thanks