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Home › GMC › 1985 › Forward Control 7.4 W, Standard › Repair and Diagnosis › Engine Performance › Ignition System › Ignition System - HEI (Federal) › Testing - ESC › 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.
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