Thanks for the suggestion Brian.
When I do a search here I see that the mass air sensor is a very common problem on the 94 E320. However, I also see that the symptoms are commonly an erratic idle. Do you frequently see symptoms like mine from the bad sensor as well?
If that's the only or most likely cause I'll have to go get it scanned.
Any other inputs or ideas?
Experience is something you don't get until just after you need it.