91 200q stalling

[Peter Henriksen <peterhe@microsoft.com>]

Same old problem: my 91 200qw occasionally drops through the idle speed
and stalls when rolling to a stop or simply letting the clutch out at or
above about 3000rpms.

Does anybody know if there's switch or valve - similar to the ones on
the MC engine (where the switch is on the throttle body and the valve
sits on the back of the airbox, I believe) - that detects idle speed and
turns on the fuel flow again or performs some similar action to keep the
engine from stalling on the 3B (20v turbo) engine?

So far, my search has been inconclusive and it's getting pretty
annoying.

Thanks (in advance and to all the nice people who answered a similar
question a couple of weeks ago - you were in the right area, but I can't
find the same functionality for the 3B engine documented anywhere).

peter, peterhe@microsoft.com, issaquah, wa, usa
  91 200qw
  94 acura legend gs
  80 mazda 626