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What problem would give me a oem code of PO440 on my chevy blazer?

(1999 Chevrolet Blazer)
in West College Corner, IN on February 20, 2012
what would most likely be the problem and what order of troubleshooting should i follow?
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Popular Answer
of Greg's Orange Auto on February 20, 2012
EVAP CONTROL ISSUE. SEEK A DIAG THESE PROBLEMS CAN BE A HAIR PULLING ISSUE EVEN FOR US
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