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GMC
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1990
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Forward Control 5.7 K, Standard
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Tests W/O Codes
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Symptoms (Diesel)
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Engine Will Not Idle
Engine Will Not Idle
ENGINE WILL NOT IDLE
Possible Cause
Correction
Linkage binding or misadjusted
Remove binding and readjust linkage
Restricted Air Filter
Check and/or replace air filter
Defective injection pump
Replace injection pump, see SYSTEM/COMP TESTS