Operation CHARM
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GMC Truck
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1988
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R 3500 P/U 2WD V8-454 7.4L VIN W 4-bbl
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Repair and Diagnosis
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Powertrain Management
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Computers and Control Systems
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Testing and Inspection
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Scan Tool Testing and Procedures
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Positions
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Desired RPM
Desired RPM
Indicates RPM to which ECM is trying to control
idle speed
.