Again, all of this refers to '84 Vanagon, 1.9L engine, automatic
transmission.

Running out of options so looking for the less obvious.  When I put in
new long block in 2003, engine ran fine with idle screw 1/2-turn CCW and
throttle body used with old engine.  A couple of years later, I was able
to get a rebuilt throttle body and had it installed by mechanic at local
TBA store (unfortunately no longer there).  Automatic transmission was
rebuilt in 2010 and problems with engine performance began about a year
later.

One thing about current situation is that engine speed too low even at
two turns CCW on the idle screw.  Started looking at throttle pushrod.
Loosened lock nut and moved adjusting screw in about five turns and
tightened the lock nut.  Engine RPMs more than enough to backoff on idle
adjust screw.  However, any side-to-side movement in throttle pushrod
causes engine idle to drop off.  Is this normal?

John