Operation CHARM
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GMC Truck
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1988
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C 2500 Truck 2WD V8-454 7.4L
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Repair and Diagnosis
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Throttle Body
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Service and Repair
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Concealment Plug Removal
Concealment Plug Removal
Concealment Plug Removal:
If necessary to adjust minimum
idle speed
, the concealment plug must first be removed. Refer to
Fig. 343
when removing plug.