Has anyone come across this problem before? I own a 56 plate 1.2 reference Ibiza that has done 13000 miles. Over the last 6000 miles the car has developed a shake at tickover which can be quite uncomfortable. The dealers have replaced two coils at different times which seems to make it better for about a day. Other symptoms are the exhaust immision warning light has come on if the engine has been put under load and then stays on for about an hour. I use this car as a driving school car and its my second 1.2 Ibiza, the first one was as smooth as a babies bum. Any help would be appreciated as the dealers don't seem to know what the're doing.