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Home >> GMC >> 2003 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Controls - Basic Diagnostic Procedures - 6.6L Diesel) >> Idle Speed

Idle Speed

WARNING: This page is about a different variant/trim than selected.

Idle speed is controlled by ECM. Incorrect idle speeds are normally caused by dirty throttle plates or vacuum leaks.

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