Does the stalling occur only after the car has been driven
20 minutes or so? If so, I would suspect the ignition coil.
How old is yours? Is it OEM?

Do check the level in the cooling system reservoir; top off
per the manual; purge of air. Forty minutes may be required
before the fan comes on twice during the purge procedure.
(Have you had any work done on the cooling system recently?)

The EACV (a.k.a. IACV) is also a candidate here.

Exact conditions under which it happens? Cold, hot, warming up? Length of
time it will idle badly before dying? What happens if you try to help it
with the gas?

An air leak will cause elevated idle or fluctuating idle. You do not have
an air leak.

92 Accord with 200K miles, runs great, want to drive forever.  Problem i
it ocassionally wil
not idle worth a darn, drops off and stalls.  Will go away for months the
return.  Have factory m. and the idle woes all should generate a troubl
code- none present.  Any advice fellas-suspect a vacuum leak somewhere bu
can't seem to find one. The car runs excellent- 200psi on all 4 cyl, thi
things runs better and better, except this annoying, intermittent problem
Live in the SE so I doubt water in the gas.  Thanks everyone
If you have checked or replaced your basic items like
-spark plug
-spark plug wire
-distributer cap and rote
-fuel filte
-air filte

Then i would start looking at other possibilitys

have any rpm fluctuating? if so it could be an
-IAC  (idle air control valve)
-or a fuel pump getting weak and not delivering enough fuel
supply to the engin
-throttle body "needing cleaning"

i would take off the old fuel filter cut it in half and
check for metal fillings & particilles? if you find any
in there that will tell you your fuel pump is on its way out
soon and is probably the culprit

"intermittent problems" are difficult to diagnose because
they dont act up when you whant them to act up for a technition
However i will say your problem is either "electrical or fuel" related

--
johnin

I recently experienced similar problems with my 1988 Accord LXi (original
owner, 185K miles). Distributor vacuum leak detected, repaired: no
improvement. Original fuel filter replaced: no improvement. Air (probably
from failed hose repair prior year) purged from cooling system: no
improvement. Main fuel relay intermittency detected, component replaced: no
improvement. TW sensor intermittency detected, component replaced: problem
solved.