I moved the IAC Effective area table down 4 places. Decel to Idle at(800rpm) allows the car to settle within a few swings between 600rpm and 900rpm. Once settled idle is really quite steady. Oh, added bonus with AC on car dies when almost stopped, stationary.
I'm excited to try bink posted idea's tonight. I've also read up on Throttle Cracker information; its unclear, so far, how that affects an ETC car like my Vette. The learning continues, thank you for all the information.
Kevin