Auto Tech & Repair

» PaulRobertWynn - interpreting codes

My 1999 GMC suburban failed the emmissions test. The code indicated is 440. I don't know where to start looking for the cure. The car makes a vacuumn leak/suction sound from up front some where. I replaced the gas cap and when I sucked on it, it made the identicle sound that I hear from someplace up front. It occurs when I am driving and let up on the gas. Can you help me? Thanks, Paul

-- posted by PaulRobertWynn

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