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loganbryant

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  1. loganbryant
    I have 1999 silverado with a 5.3L. 112K miles. I had recently changed my Vapor Canister Vent Valve with an ac delco one. The CEL went away, and then probably four months later it came back on. I replaced the gas cap with an ac delco one as well. Now it reads p0440 and p0449, I figured the next plan of action was the vapor canister purge valve. Any thoughts?
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