In a message dated 01/12/2000 12:58:10 AM Eastern Standard Time,
glmce@HOTMAIL.COM writes:

<< The part number on the stabilizer in my vehicle is 251-907-393B. This part
 number does not match the number i found on the BusDepot web site for a 1987
 model. Is this the correct part number for my van? >>

This part number is the correct one for an '87 Vanagon.  Bascially they are
all the same and interchangable on the 2.1l engines (I have done it so I
know).  The number is the same for all the 2.1l years: 251 907 393.  The last
letter is date sensitive.  A is for 86, B is for '87, etc.  It doesn't effect
how the stabilizer works, just when it was made.

If you van has gone over 60k miles without having the oxygen sensor changed
then I wouldn't hesitate to change it (this is the recommended interval).  I
would change it with one that has the OE connectors as this will eliminate
any possibility of a bad splice.  I sell these for $120, but it is worth the
peace of mind when you are trying to troubleshoot a system that you didn't
just introduce another problem by a bad splice connection.

You should also:
Check ground connections to see if they are clean and secure.
Check exhaust system for leaks
Check fuel injectors for proper spray pattern and proper shut off.
Swap over known good fuel pressure regulator from another van or take a
reading from a good running van to see what your fuel pressure should be.

Hope this helps,
Ken Wilford
http://www.vanagain.com
John 3:16
Phone: (856)-765-1583
Shop:   (856)-327-0027
Fax:     (856)-327-2242