06 Cobalt with P0171 Code and losing MPG

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#1
For the past couple of weeks I have had my service engine light on in my 06 colbalt. I have had the codes pulled and it is P0171. I have done a little research and it says the gas is too rich. I saw some TSBs on it but didn't see the full article. Has anybody had this problem before or know how to fix it? It jerks a little when going up a hill as well

Thanks
 

Gus

wrench
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#2
Under 36K miles? If yes, let the dealer fix it...