History - recent engine Overhaul due to head gasket blowout.
Problem - When up to normal operating temperature the idle starts fluctuating up & down (+-) 1000 rpm's in neutral or when in gear it will frequently stall out, in the driveway or at a traffic stop.
Attempts -
To no success; Cleaned out carbon build-up in throttle body and IAC unit. - Checked and secured all grounds. - Removed O2 sensor and visibly checked for anything out of the ordinary.

Strongly appreciate any Help, Suggestions or Advice!!
Rich