Idle Speed Control Units Function: Monitors engine RPM and modulates idle air or throttle input to maintain a steady idle, reducing stalling and idle fluctuations. Benefits: Keeps idle smooth under A/C and other electrical loads; improves drivability; reduces wear from stalling; enables reliable starts in cold weather. Compatibility: Works with most electronic throttle bodies and idle control valves; compatible with EFI engines using CAN, PWM, or analog interfaces. Size and material: Rugged aluminum enclosure; compact footprint to fit in tight engine bays; sealed against dust and moisture; standard automotive connectors. Performance: Fast response and precise control; stable idle across operating temperatures and fuel quality. Use scenarios: Automotive: restores smooth idle on fuel injected engines after ECU updates or controller tunes. Classic or swapped vehicles: retrofits idle control to provide consistent idle without mechanical shims. Marine or standby power: maintains stable idle on engines with changing electrical loads.