Chevy Malibu 2009 2.4l is throwing p0171 code

What is your question?

Just replace purge valve solonied and vent valve after it threw those codes replace o2 sensor upstream downstream, smoke test to see if leak in system found throttle bottle gasket or grommet that connect the engine cover to the throttle body was torn. Check fuel pump on scan tool checks out with pressure good , replaced gas cap checked fuel injectors and reset the light still coming on. Did tune up about 6 months ago Engine runs good but once lights comes on you get a increase of the rpms fluctuating but now I'm lost any answers on what to check or change next.

What makes this problem better or worse?

When the light comes on

How long has your 2009 Chevrolet Malibu had this problem?

Few days about 4