Lack of power, white smoke then normal and judders quite a lot?

i have a nissan almera tino, 2.2 diesel, 51 reg. the past few days when i start it first time it started off ok, then there was a lack of power when i place my foot on gas and it shook quite a bit and lots of white smoke started coming out of tailpipe and it was like something was blocked and then it would go normal and be ok all day then when i am driving around its ok when accelerating but when i take my foot off gas it judders quite a lot and the engine seems to jolt.

sounds like your injectors need replacing

It sounds like either a dying turbo charger (they can work intermittently when bearings are failing) or fuel pump.

well,you need to change your fuel filter you probably have lots of water in your fuel also try running a excellent fuel additive like power service brand truck drivers also use this as do i if you live in a cold climate this is a must excellent luck let me know if this works

Head Gasket! If thats what it is, its an expensive fix. they have to take the motor apart.