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Emission Control- Check Engine Light Problem


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I have a 2003 Silverado Reg. Cab Automatic 4.3 V-6. The gas cap was bad and was causing the Check engine light to come on. I replaced the gas cap and now the light is back on again. I took it to Auto Zone and They said it was an Emission control Leak. I guess it could be a Vacuum leak? The truck still runs fine and drives like the day I bought it. Any ideas?

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