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Does it still have the AIR stuff hooked up and the EVAP stuff? If the EVAP solenoid goes bad (it's on the side of the intake) it might allow air to be sucked into the intake all the time which will act like a vacuum leak. You might need someone to scan it to check the fuel trims.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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