In rec.autos.makers.vw.watercooled, miv wrote:

>jetta drives up to 40mph and than it starts to shutdown. what can be
>causing this?

I don't know what you mean by shutdown, but a clogged fuel filter
can have a symptom that could fit your description. This would
assume that "shutdown" means sputters and loses power but does
continue to run.

If shutdown means the engine dies, then this would not apply.