Help with Vauxhall Vivaro Van

[videodoctor]

I know this is a Vectra site but I'm hoping there might be some Vauxhall mechanics on here

I have an 04 plate 1.9 Diesel Vivaro and for the past few days its been jagging as its driving along.If it was a petrol then it feels like a misfire.
The van starts first time,every time and in general runs fine with plenty of power and no smoke.When it jags,it only lasts for a few seconds and then it clears and its fine again.There has been no dash lights on at all.

We have just put new diesel in today and added a diesel cleaner to the tank to help the injectors.

Has anyone any idea what could be causing this?

Thanks for your help guys.

[Gsi3.2]

well, the good news is not all fault codes cause the EML to come on, so it's still worth getting it plugged in to dealer level equipment..

it could be so many things that it's going to be a guessing game from this distance

[Super T]

I had the 19cdti and mine suffered with the wireless connections on the accelarator.It's called a paten?????? who knows!!

[AndrewTi]

Potentiometer?