My wife has a1998 Golf 1.6 SE. For at least 6 months now, the idle speed sometimes rises to about 1400rpm then drops down again. It can happen anytime, when hot or cold. Other times it fluctuates between 800 and 1400rpm constantly. The problem is annoyingly intermittent though.
It has been serviced twice now since the problem first started, at two different garages. Both garages plugged the car into the computer system, but it showed no faults when there obviously is. Both times at both garages I was present when it was checked on the computer, so I know it has been done.
Does any of you good people have any idea what the problem could be, or is it just a case of throwing money at it replacing different parts until the problem is found?
Thanks in advance, Stuart.