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You may want to check the EVAP lines going to the charcoal cannister behind the driver's rear wheel first(if that's where it's located). They can get rock hard over time and crack. The hissing noise might be a big vacuum leak from a cracked or disconnected hose. That would cause it to lean out pretty bad and give you the gas smell from the charcoal cannister.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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