I have a Y reg (2001) Ford Focus Ghia.
It is a 1.8L Petrol.
When you turn the car on and let it idle - or if you stop in traffic, the revs seem a little low. It's almost like it's struggling to stay turned on.
Sometimes the battery light switches on, as if it's stalled, although immediately goes out, the car kinda "coughs" and runs the same.
It has once or twice entirely stalled. But re-starts with no issue.
Do you know why this is happening?