S10/T10 Blazer 4WD V6-173 2.8L VIN B 2-bbl (1983)
Idle/Throttle Speed Control Unit: Description and Operation
Computer Command Control (C-3) System
The ISC assembly controls engine idle speed according to ECM programming.
When the throttle lever rests against the ISC plunger, the ISC acts as a dashpot on throttle closing per second.
