Tracym

If it is the turbo that needs replacing or repairing then surely it would blow out black smoke which it isn't , the smoke is clean ... Been told it could poss be a hose that needs replacing

I have just purchased a galaxy zetec 1.9 TDI and going uphill and overtaking it's losing power occasionally unless I turn engine on/off which resolves it for a while. I have no indicator lights , no black smoke. I have been told it has been fitted with a performance chip. Any ideas what it could be ?