I think there was a TSB recall for the AIR wiring harness but I can't remember which years. But I thought that problem would lead to blown fuses which you aren't having problems with. It sounds like you've got an intermittent power problem to the AIR pump. Unless the real problem is the EVAP solenoid that purges fumes from the gas tank and not the AIR solenoid.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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