Operation CHARM
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GMC Truck
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1991
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S15/T15 2WD P/U V6-173 2.8L
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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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Spark Plug
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Specifications
Spark Plug: Specifications
Engine 2.8L (173 cid)
Plug Gap .045 inches