I went to Detroit Speedworks / Livernois to get my car custom dyno tuned. I too was having idle issues and we got everything worked out perfectly on the dyno. I got my air-fuel ratio at a nice safe 12.5-12.6 all the way through the run and it smoothed out my power and torque curves very well. I was at the dyno about half a day and it cost ~$500 with the bung installation for the wide-band.
$750 sounds a little high.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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