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GMC
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1985
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Forward Control 7.4 W, Standard
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Repair and Diagnosis
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Engine Performance
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Ignition System
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Ignition System - HEI (Federal)
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Testing - ESC
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Notes
Testing - ESC: Notes
NOTE:
Electronic Spark Control (ESC) is used on Chevrolet and GMC models using the 5.0L 4-Bbl. (VIN H) engine.