You don't say if you have the old style diesel fuel pump or the common rail high presure pump either way, try changing the fuel filter and putting a bit of fuel cleaner directly in the fuel filter before bleeding the system then add the rest to the fuel tank ( Don't fill the tank up ) and then take the van for a good hard thrash Low gears high revs to clean out the injectors and the exhaust. This should clean them out and hopefully help to sort out the problem if it remains the same it could indicate that it is terminal.
arizona kid, June 2011
