issues with OBDII computer

[LSx_88_Ciera]

Have you disconnected the IAC to check base idle. IIRC it should be 650rpm when fully warmed up. It sounds to me as though you have a bad IAC cleaning them will only fix the issue 50% of the time at best and can actually make things worse depending on how harsh the solvent is. It is actually not recommended to clean them since they are only designed for air and virtually any solvent can cause damage. I am as guilty of cleaning them as the next guy but I read somewhere that it is a bad idea so I no longer do.
What kind of scan tool does your uncle have? If a snap-on some have a generic function which will attempt to communicate with the ecm without you entering vin data. This could be helpful since it is a custom program and there might not be any vin specific data anymore.

[MonzaRacer]

use obdII generic scan on reflashed ecms usually works, now you als need to make sure the power and ground are present at DLC connector.
Ill post up the pics of them.