If the injector lights are going off you may have a Hall sender problem.
No RPM signal, no injection.  Try jiggling the Hall sender connection
while idling and see if you can get the engine to buck.  If so, it may be
grounding.  Use electrical tape or epoxy to stop it from grounding.

Also, Jim Thompson from the Old Volks home advertised that he had just the
Hall sender part of the distributor (only place I've seen it available w/o
the whole dist).  Still not cheap, but better than the whole distributor.
Check the archives...

-Karl

Karl F. Bloss - blosskf@apci.com or bloss@enter.net
'87 Vanagon GL Weekender "Beverley"; Trexlertown, PA
http://www.enter.net/~bloss/vw/
VW shops: http://www.enter.net/~bloss/vw/vwshops/