I have seen this before on customer's vans.  I just always figured it was due
to mileage and time.  I have a few Vanagon coils in stock that I would sell
for a really low price (they are Bosch).  Normally these go for around $75.
I will sell the ones I have for $30 each.  These have the distributor
terminal that will accept the push in connectors only (the OE pin setup spark
plug wires won't work with this coil).  I only have a few so if you want one
drop me a line.

Thanks,
Ken Wilford
http://www.vanagain.com
John 3:16

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