In the last couple of days, we've started to experience problems starting our clio. It will start to turn over but then just die. After a dozen times or so trying this, and some coughing and spluttering (the car, not me), it will eventually kick into life, cough plenty of smoke from the exhaust, and then run normally. But, with a bit of a new rattle. I have looked underneath for loose exhaust fastenings but can't see anything. The rattle isn't very loud and is intermittent, appearing when driving when the engine is working hard. I've used it on some long runs in the last week (3 No. ~200 mile trips) when normally it is my wife's run around to work and back. I've also been filling it up recently at a petrol station I haven't used before. I say this because my first thought was fuel filter or dirty fuel? No warning lights coming on either. Anyone have any idea what's going on?