1997 Saturn SC1 IDLE VARIES ON COLD STARTS

Clean out the idle air control valve and see what happens.

It's located on the throttle body assembly-see diagram below:

REMOVAL
Turn ignition Off.
Remove air intake tube and resonator.
Remove electrical connector from the IAC valve.
Remove screws and IAC valve. NOTE: The IAC valve is an electrical component and must not be soaked in any liquid solvent; otherwise damage could result.
Remove O-ring from IAC valve and discard.

INSTALLATION
Clean the IAC valve seating surfaces on the throttle body to assure proper seal of the new O-ring and contact of the IAC valve flange. NOTE: Before installing a new IAC valve, retract the pintle using the Scan tool. Refer to Scan tool operating instructions. NOTE: Normal wear of the IAC pintle, characterized by a ring around the cone, is not an indication of a bad IAC valve.
Lubricate new Oring with clean engine oil and install on IAC valve. NOTE: If replacement is necessary, be sure to replace with an identical part. IAC valve pintle shape and diameter are designed for specific applications.
Insert IAC valve in throttle body.
Install IAC valve attaching screws using thread coating, Saturn P/N 21485277 (Loctite 242 Threadlocker or equivalent).
- Torque: 3 N.m (27 in-lbs)
Connect electrical connector to IAC valve. Push in connector until a click is heard and pull back to confirm a positive engagement.

https://www.2carpros.com/kpages/auto_repair_manuals_alldata.htm

Carb cleaner/decarbonizer