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1998 Sierra 5.7 codes p1404@p0440

By RWF1970
November 6, 2016 in 1988-1999 Chevrolet & GMC C/K GMT400 Platform

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RWF1970

Posted November 6, 2016

Posted November 6, 2016

I replaced the egr valve and the canister. Now the check engine light comes on for a few days and then goes off for a few. Also still surging between 12 and 1800 rpms Any ideas about either problem? These were the codes I got before I changed the parts

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