e220 cdi surges on idle

[Locky]

Hi all,

I went for a run down to portsmouth and back the other day. After I came off the the A31 duel carriageway I had to stop at the roundabout. From idle it surged. I almost thought I had been nudged from behind.

I carried on, but now it happens once every couple of days.

Does anyone have any experience of this?

Thanks