rough idle

["Jeff Angwin" <jeff@xxxx>]

Hi all from a long time lurker. Thanks to the wealth of information 
presented here, I was able to buy my "D" with a good amount of 
knowledge and confidence, and now I am the current caretaker of VIN 
3034!

It runs well except that at idle it's rough. It starts just fine, but 
the idle RPM's fluctuate between 600 and 1000, every second or so. 
When I accellerate, it runs just fine, near as I can tell. The gas 
mileage is low (I think, although I have nothing to compare it to) at 
about 15 MPG around town, and that's after putting about 600 miles on 
it for the last 3 weeks. The frequency valve is not buzzing at idle.

Any ideas on where to start troubleshooting? Also, what MPG should I 
expect in stop and go daily commuting? (it's an automatic)

Thanks!

Jeff
VIN 3034
jeff@xxxx