Santoszach9

Trying to Solve P0171 on 2015 ATS

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Can’t quite narrow down the answer I have a 2015 Cadillac ATS 2.0 and nothing really seems to narrow it down where Are common air leak spots? My air filter isn’t saturated with dirt but is a little dirty grey I believe it’s still okay and my car is a 2015 it wouldn’t be the spark plug my car is almost to 60,000 miles on it and I don’t believe it’s had it’s first tune up would that Cause Po171 to trigger? Sometimes feels shaky or like it’s misfiring somewhere or just jumpy then goes back to normal but doesn’t always do it. I would say when I take off the gas cap then it does it but I’m not sure but it doesn’t always do it I’m not sure if it’s because I open the cap air gets in there which is telling the computer to send more fuel I’m not sure I need more possibilities please help.what 

 

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