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Sounds like you already got it narrowed down to the filter lol

A P0171 code is set by your vehicle's powertrain control module (PCM) when it detects that the air-to-fuel ratio of your vehicle is too lean

"Too lean" means not enough gas. In other words too much air. Cover up parts of your new filter media with duct tape until it starts running fine. Then you will have proven to yourself that you should have never bought that filter.
 
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