My Golf will run fine then suddenly I loose.

Have the fuel pressure tested.

A bad hall sensor in the distributor can cause skipping / hesitation and stalling. With engine
starting again after it has cooled off.

The next time it stalls / does not start, check for spark.

Thomas

It could also be the camshaft postion sensor or the coil could be going bad.
But in any of these cases exovcds is correct in saying that you should check for spark.

1991 does not have a camshaft position sensor. Just the Hall Sensor in the Distributor.

Thomas

I kind of remember how a Hall sensor works as I had a car with a speedometer that used a Hall field to move the needle. It is a coil and magnet type of setup isn't it?
Please let me know as I do not remember and it is bugging me.

Sorry about the late reply. Haven't been getting all the update notifications.

The Hall sensor in the distributor is a magnet & Transistor pair that is triggered by a rotating metal shutter wheel (4 windows). When the transistor
is turned on, it grounds the wire (middle wire of plug connector) that goes to the ECM. When the ECM "sees" ground on that wire, it triggers the Ignition coil.

The hall sensor in this application is a square wave on/off signal. VW used either 12 or 5v operating voltages (outer two wires of plug connector).

Google or Youtube can explain better than I. :-)

Thomas

Thanks for that information. Information is Golden as they say.
Thanks
Dr. C