Well its been doing it more lately. When it happens its during coasting with gentle braking. I've been watching the tach sometimes dip below 500 and then jump back up. I can't force it to stall out, it just does it on its own. 99% of the time, there no sign of a problem.

I found some history on this car. Turns out it had this problem for a very long time, like since it was brand new! The original owners only kept it for 2 years because MB could not figure it out. Then my dad had it and spent thousands on new parts, but the problem never was resolved.

I though I had it licked when I tightened up various connectors, and it hadn't stalled in months. Now its bordering on dangerous, since it can happen on a highway off-ramp for instance, and its unpredictable.

All vacuum hoses are tight with no cracks. I'm wondering if the little vacuum bypass upgrade on the ICV might fix this?

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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