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GMC Truck
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1986
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Safari Van M L4-151 2.5L
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Repair and Diagnosis
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Powertrain Management
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Tune-up and Engine Performance Checks
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Idle Speed
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Adjustments
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Fast Idle Speed
Fast Idle Speed
4-151 TBI ENGINE
Fast
idle speed
is controlled by the Electronic Control Module
(ECM)
and is not adjustable.