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Home >> GMC >> 1983 >> Magnavan 5.7 L, 475/M40 >> Repair and Diagnosis >> Engine Performance >> System >> Pulse Air Injection System >> Trouble Shooting >> Surge Or Poor Performance
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Surge Or Poor Performance

May be caused by failure of 1 or more check valves. Exhaust gas will enter carburetor through air cleaner and cause poor driveability.