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GMC
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1981
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Pickup C1500, 4.1L Eng VIN D, Automatic Trans
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Repair and Diagnosis
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Engine Performance
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Engine Control Systems
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Pulse Air Injection
Pulse Air Injection
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Description
Operation
Testing
Functional Test
Trouble Shooting
Failure Diagnosis
Short Hissing Noise
Surge or Poor Performance
Excessive Heat; Paint Burned Off of Valve
Poor Driveability