Nissan Cabstar

Hello friends, I hope you can help me.
Problem:
Nissan Cabstar, at optimal engine temperature and in a maximum parliament suddenly, if you continue to thrown through the white smoke escape (only on these occasions) and make deflagrations (explosions), as soon as it stops accelerating and the revolutions go down to idle can be accelerated and the engine replaces without problems until it reaches the regime of revolutions between 3000 and then.
I have reviewed the electronic pedal, changed diesel and air filters, proven the fuel flow and I am lost, I appreciate in advance any help and orientation.