Not a 3 guy but always willing to chime in.
As suggested above--If you don't normally use Techron or BK-44 fuel injector cleaner, give it a try. If your injectors are spitting and sputtering because they are dirty it accentuates any stall at idle problems the car may have.
And your gas mileage will go up too
And no matter what remember that it could be worse
The Jaguar XK8 stalls for no apparent reason at highway speeds. Just stops running on the freeway! Restarts ok. Dealers charged $4800 to fix it and a year later it starts happening again. Jaguar just started fixing them last year after about 10 years on the market