'91 Coupe Quattro Problem

["Chris Gharibo" <gharibo1@jeflin.tju.edu>]

I have a '91 Audi Coupe with 34k miles.  Last several days as I am driving
the car, the engine would instantly cut off and come back on again, several
times a trip.  The situation progressively worsened so that today the car
just stalled at idle and I had considerable difficulty restarting it.  As I
was driving it back home it cut out and came back on again.

The car still has the original fuel filter and I am thinking this may be
the problem?  Any other thoughts on what's most likely causing this?

Thanks,
Chris