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Hi, I'm new to this site so please bear with me. I recently bought a used 2017 impreza. The car seems to run fine except for some roughness at idle. No codes or lights etc.

My only concern is that the long term fuel trim hovers at about - 8% at idle. This is my first subaru and I was wondering if this is normal? Do your cars have similar trims?
 

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How are you finding your fuel trims. Also the car has a high idle till it warms it up. The ecu tuning on these cars favours economy a bit much and leaves alot to be improved upon. We need a tuner on this forum haha!
 
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