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Problem with it stalling or revving when the engine is cold

Car: Subaru, Forester, 2004     -    Back to Fix-It    -    Subaru Repair Manuals

Q.2004 Subaru Forester, 156,000 miles. Several weeks problem with it stalling or revving when the engine is cold (Maine). When stalls, check engine light comes on fleetingly. Problem goes away after the engine is warmed up over several miles, sometimes works fine after engine off several hrs. After overnight always has either stalling at idle, or other times it revs at idle - up to 3500 rpms for the first few minutes, then slowly less and less. As the revving slowly abates over several minutes, at idle engine will persistently gun somewhat, revving from about 1100 to about 2000 rpms. Dry gas - no dif.
Engine runs smoothly, acceleration is smooth.
To dealer now four times for this.
!st time - Level 4 servicing, with spark plugs, fuel filter, air filter replaced
2nd - no problem found
3rd - cleaned throttle of carbon
4th - left overnight, had problem, replaced sensor for air fuel ratio. They tried it after 5 hrs - ran fine. I picked it up that night, same problems, no better.

Answer Hello. Is this a turbo model?

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