Operation CHARM
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Buick
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1991
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Regal V6-191 3.1L
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Repair and Diagnosis
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Powertrain Management
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Ignition System
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Spark Plug
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Technical Service Bulletins
Spark Plug: Technical Service Bulletins
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Ignition - Revised Spark Plug Usage & Gap Information
Spark Plug - Torque Revision
Spark Plug - Revised, Service Information