Can anyone help please ,my ford focus cl 1.8 turbo diesel keeps cutting out, it seems to do this mostley going up hills or under load.When it does it, its only for a second which just makes it jerk.When it happens the ignition lights come on then go offf after a second.It seems to do it mostley once it warms up a bit.Any ideas would be greatley appreaciated as its driving me nuts.