Tune-Up Notes

IDLE SPEED ADJUSTMENT CAUTION - Procedures and specifications for idle speed adjustment must be followed exactly as outlined. See "Hot (Slow) Idle RPM" under Tune-Up.

NOTE: For other items affecting Tune-Up, see CARBURETION Section or EMISSION CONTROL Section.

NOTE: Due to changes and corrections, always refer to Engine Tune-Up Decal in engine compartment before attempting Tune-Up. In the event of a conflict between specifications given in this manual and decal specifications, decal specifications prevail.

NOTE: For Tune-Up purposes only, Light Duty (L/D) will refer to all 10 series, C-20 Suburban, K-20 Suburban, G-20 Sportvan and G-30 Sportvan. Heavy Duty (H/D) will refer to all remaining models.