Hello,
Can anyone help with this question.  I have a 2000 Mitsubishi Galant ES
with 4cyl, SOHC engine with 79,000 miles

It stalls while idling but only while warming up as I will describe here.
It idles fine for the first couple of minutes after starting with a cold
engine. Then stalls while idling for about the next 10-15 minutes. Then
after a while idles fine again. Otherwise engine runs very smooth at all
speeds, except stalls at idle as described above. I can keep the engine
from stalling at idle by pressing gas pedal slightly to keep RPM's to just
under 1,000. Also, when engine stalls it is smooth, no jerky motion from
engine. It's as if someone turned off the key.

Engine always starts immediately when starter engaged (at any time).

No OBD / DTC codes set. Spark plugs and air filter replaced ~6mos ago with
no problems until this week. Has integrated fuel pump filter that factory
says should not need to be changed.

I live in coastal San Diego with a very mild climate. Outdoor temperatue
in 70's F.

Does anyone have any ideas on diagnosing? Any suggestions would be greatly
appreciated.

Robert