I keep getting a problem whenever my car has been on a Motorway/dual carriageway run. I recently went from Manchester to Glasgow for the weekend and upon returning back to Manchester the Emission Control Warning light came on when I exited the Motorway after approx 4 hours driving. The light stayed on for 2 days and then went off. This was 2 weeks ago. The light has now come back on and been on for approx 48 hours and I haven't done any long driving runs. The other problem I have is erratic idle speed again every time I go on a motorway run, even if its just for a couple of miles. When I exit the motorway and come to a stop, the idle speed varies between 1000 and as much as 1400 rpm sometimes, it sounds like my car is revving its tits off! The only way I can bring it down is to gently let the clutch out a bit, but as soon as I depress the clutch again the idle speed begins to creep up. Its so annoying that I now hate it every time I use a Motorway or similar type of road. I have had the Coil pack recall done plus recent Cambelt & water pump change, but the erratic idle speed was present before these were done anyway. Anyone have any ideas what the problems could be? Could they be linked? Thanks, Dan.