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GMC Truck
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1991
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S15/T15 2WD P/U L4-151 2.5L
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Repair and Diagnosis
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Maintenance
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Tune-up and Engine Performance Checks
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Ignition Timing
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Specifications
Ignition Timing: Specifications
Engine 2.5L (151 cid)
Base Timing 8~ BTDC (Manual Trans).
Engine 2.5L (151 cid)
Base Timing 8~ BTDC (Auto Trans).