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Chevrolet
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1991
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C3500 HD 7.4 N, Standard, NV4500/MT8
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Repair and Diagnosis (Single Page)
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Engine Performance
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Engine Controls - Specifications
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Fuel System
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Idle Speed & Mixture
Idle Speed & Mixture
NOTE:
Idle mixture on fuel injected models is controlled by the Electronic Control Module (ECM) and is not adjustable.