what problem would give me a oem code of PO440 on my chevy blazer? on 1999 Chevrolet Blazer

what would most likely be the problem and what order of troubleshooting should i follow?

by in West College Corner, IN on February 20, 2012
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1 answer
ANSWER by , February 20, 2012
EVAP CONTROL ISSUE. SEEK A DIAG THESE PROBLEMS CAN BE A HAIR PULLING ISSUE EVEN FOR US