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What year is your Carrera? Seems to me that you've got an evap leak somewhere. The source of the leak could be the evap canister purge valve. I would recommend using your scanner to check the fuel trim values while out on your drive. If you notice them moving all over the map rich and lean chances are you have a faulty evap canister purge valve. If they stay mostly lean I would be looking for an EVAP leak. The purge valve is located in the engine compartment on the driver side.
- Casey
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