I have a 56 reg focus ghia.
When i first start it up its fine but after a few minutes when i push the clutch down to stop the rev counter will go really low and the battery light will flash on then the revs will shoot back up just before the car stalls. it will yo yo up and down like this until the car has warmed up then it is fine. Today for the first time the revs dropped that much that the car stalled. The car has only been doing this for a few weeks and it is slowly getting worse. There are no fault lights on, and the car always starts fine.
Does anyone know what this could be?