Thanks for all the info on how to adjust the isc.
After I had an intake gasket replaced, the idle was high and the motor felt like it was on cruise control when I lifted my foot off the gas. I replaced almost every vacuum hose, but couldn't fix it until I tried the easy isc idle adjust as suggested by Ranger and others. Now my 95 Deville with 4.9 runs like a Cadillac again. Thanks to everyone.