strange running

[Teddy]

right just put me new engine in pug been running brilliant until this morning runs fine when u first start it video below http://www.youtube.com/watch?v=PLGayJXblK4
then it starts to miss fire a bit and put out white smoke after u rev it goes away for a bit then comes back http://www.youtube.com/watch?v=oko2w7AmUmo
is it air getting into fuel ?

[Tom]

Looks like an xud to me. Sound qualitys a bit rubbish so its hard to hear how rough it sounds, does it go away comepletely when its warmed up and dringing round, literally just a cold problem?

[Teddy]

doesnt sound ruff just miss fires a bit and when u rev and go a long its fine just when u leave it to idle it smokes

[Tom]

Is it just when its cold though? As long as it clears up when warm i wouldnt even worry about it.

[Dave]

If it doesn't clear up when it's totally warm could be a duff injector or try advancing the timing slightly first to see if it clears up. Looks exactly like what happened with Ruans car when he first put an XUD in his '6 and the pump was a tad retarded - advancing it on the slots made it spot on.