Can someone explain exactly what the MAF sensor does vs what the Throttle actuator do? I'm trying to get a feel for the job of each and, therefore, the symptoms of a problem with each of them vs the other.

Thanks -- I'm pretty much having the same issue, but I have surging idle, too.

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1994 C280, dark green metallic
105k miles

1991 190E 2.6, Black
191,500 miles
(sold to another forum member)

2003 Chevy Tahoe LT, Redfire Metallic
105k miles

1989 Mustang GT Cobra Convertible
43k miles