2010 3.0 V6 diesel 237bhp On a few occasions (but not every time) if I stop and restart my engine after a couple of minutes (after refuelling say) the engine will "hunt" on idle with the revs surging between 500 and 1200 or so. If I put it into drive it continues to surge but once I drive off it seems to clear and won't re-occur when I just stop the car. Stopping the engine though sometimes will re-create the problem on restart. Idle control mechanism or some other known problem?