Really need some help with a problem with my 53 plate stilo, it's a 1.6 petrol, it is intermittently not starting and randomly cutting out with no notice, regardless if I'm sitting on the motorway or pulling out at a junction, there is all sorts of messages coming up on dash like, loose connection, alternator, temp high, airbag fault, car security, I checked for fault codes and it has u1600 and p1687 stored, any ideas anyone? I've checked battery voltage and alternator is charging, I've put a jump lead from engine to battery negative incase it was a bad engine earth, still he same, I bypassed fuel inertia switch, not that at fault either