I have had the car for 5 months purchased from my local main dealer and from day one it has had an internittent issue with rough idling/uneven tickover which when crawling in traffic results in the car lurching/kangarooing. Once you increse the revs it clears. On purchase the car had done 36K miles, currently on 50K

Dealer have had the car back 3 times to rectify so far without success including replacing all glowplugs which has made no difference

Any thoughts would be much appreciated.