berlingo van losing power,revs up and down?

Could be a number of things but my first instinct would be to look for an air leak,bend the fuel pipes in your hand if there is signs of cracking I would change them,if you haven't touched anything i.e changed fuel filter or pipes before this problem arose then I would put it down to wear and tear first,it's drawing in air on the fuel line.

rich
April 2012