Brad's Car Manuals
: A 3rd party mirror of CHARM + LEMON car manuals
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GMC
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1991
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Forward Control 7.4 N
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Repair and Diagnosis
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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
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NOTE:
Idle mixture on fuel injected models is controlled by the Electronic Control Module (ECM) and is not adjustable.