2018 Vauxhall Combo 1.3 CDTI

[colin 82]

Hello

Bought the van from new. Currently has 2,000 miles on it.
In 4th gear at 2000-3000 revs the van seems to "jump" almost like loss of power then gains power.

The van has been back to the local dealer but they say they cant find a fault.

Any ideas??

Many thanks