A few times I've noticed the idle seems a little rough after driving on the motorway. For instance last night, came off the motorway and waited at a roundabout with the clutch depressed to prevent istop kicking in. Idle looks around 800rpm, but feels lumpy, like its missing on one cylinder.
Never happens with town driving. Also seems worse now I have a tank of Tesco Momentum in there.
I've searched around the net, but can't find anything similar. Others have had erratic idle speed, but mine doesn't. Anyone else experienced anything similar?