GMC C1500 Engine Vacuum Leak

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1998 GMC C1500 Vacuum Assist Leak ?

1998 GMC C1500

When I Apply The Brakes, Most Often, I Can Hear Hissing Under The Dash Where Brake Pedal Rod Goes Through Firewall. Sometimes It Works Fine...

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Asked by E.T.

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Backfire Burning Oil Compression Coolant In Oil Gas Hard to Start Hesitate Idle Erratic Idle High Idle Low Idle Rough Knock Low Power Misfire Not Cranking Over Not Running Oil Leak Overheat Ping Poor Mileage Revs Up Rich Runs Hot Runs Rough Smell Sputter Stall While Driving Stall at Idle Surge Threw a Rod Vacuum Leak

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