Its your fuel pressure regulator. pain in the rear to change. its the small brass looking thing next to the throttle with a vacuum line going to it . the part cost me 50$ and i paid a guy $ 75 to put it in. worth every penny. looks easy to change yourself, but not as easy as it looks.
There was a recall GM Recall#06160 regarding the fuel or fuel vapor. Call a dealership, give them the recall # and VIN and they should fix it for free. I'm trying it out today on my 2004 impala.
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