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GMC
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1990
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Forward Control 3.9 L
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Repair and Diagnosis
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General Information
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Engine Performance
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Map - Engine Performance & Maintenance
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Engine Performance And Maintenance
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EGR Coolers
EGR Coolers
Condition
Code
Procedure
Leaking
B
Require repair or replacement
Missing
C
Require replacement
Restricted, affecting performance
A
Require repair or replacement