Just a follow-up. Cleaning the ICV has *completely* solved my stalling problem. I'm not positive, but it looks like it meters crankcase gasses into the intake, and not fresh air. That would explain the buildup of gunk inside. I would make ICV cleaning part of regular maintenance.

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma