VW Jetta tdi cutting out
Found on our forum:

I have a 99 vw jetta tdi, It will shut down while driving and the after anywhere from a 5 minute 
to 45 min. wait , it will restart. It will crank and the glow plug light will not come on and cycle 
off.. then after the wait the glow plug light cycles and it will start.   Is this an ecu problem ?
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does it sound like engine is trying to resart ie firing at all or is it just cranking? sudden cut 
out sounds like it could be a pump solenoid 
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Try to change relay 109. You'll find more about this common problem here: 
http://www.tdiclub.com/TDIFAQ/TDiFAQ-8.html#c   
Good luck, 
Andi TDI 

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