On Thu, 10 Nov 94 11:10:38 CST Dann-o said:
>I have an 87 syncro with a befuddling problem.  There is a low rpm flat spot
>1000-2000 rpm.  This problem manifests itself only after the engine is
>warm and presumably off the cold start injector.  I have replaced the

here are some tech bulletins that might be of interest ... especially the
one about the rubber boot you mentioned! these are out on the gopher ...
but if anyone isn't able to gopher-it, let me know and i'll dump this on
you. :)
  Affected    Model   Order     Affected
   Model      Years   Number    Component        Subject
------------ ------- --------  ----------- -----------------------------
Vanagon      1986-87 87-N04    Fuel        Vanagon Surging/Stalling -
                               System      Adjusting Throttle Switches

1.9 liter    1982-85 87-N05    Engine      Easy Does It - Cross-over
Vanagon                                    Water Pipe

Vanagon      1983-90 24-24-90   Fuel       Rough Idle, Engine Stalls -
                     T01        System     Tow In

Vanagon      ALL     24-90-03   Fuel       Throttle Body - Replacement
w/ Digijet                      System
Injection

Vanagon      1986-91 24-92-01  Engine      Intermittent Misfire
w/Digifant                                 <See also TB 24-92-02>
Injection

Vanagon      1983-91 24-92-02  Engine      Driveability Complaints
Water-Boxer                                <Supercedes TB 24-92-01>

Vanagon      1986-91 24-92-01   Electrical Vanagon Intermittent
w/ Digifant                     System     Misfire
Injection

All Models   All     28-87-04   Ignition   Rough idle or misfiring
             Years              System     during partial load

ALL          ALL     88-N04     Engine     Stalling when cold, or
Hydraulic                                  zero compression
Valves
========================================================================
from Technical Newsletter, 88-N04
........................................................................
Volkswagen Technical Newsletter
88-N04

High Pressure, Low Performance

A Volkswagen that stalls when the engine is cold or after driving a few
hundred feet could be suffering from an air/fuel imbalance.  It could also
have a bad oil pump.  That's right, oil pump!  If the same engine has zero
compression, the chances are even greater than the oil pump is to blame.

If the oil pressure relief valve sticks, oil pressure could rise to over
200 psi when you accelerate to drive off.  With pressure that high, the
hydraulic valve lifters will overextend themselves, causing the valves to
hang open.  After the engine warms up, the car will probably run great the
rest of the day.  So check the oil pressure when you've tried everything
else to solve a stalling problem ... believe it or not!
========================================================================
from Service Bulletins, Model Year 1990
........................................................................
Technical Bulletin
Group:    24
Number:   24-90 T01