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2009 FX 50 with 130K Miles , I chnageg my plugs and went back with E3 plugs. It ran fine for a day then suddenly idles rough and I am getting codes P0171 fuel injection system too lean on bank 1 and P0300 misfire ? I rechecked all the vacuum lines and everything I took apart.
What do I do next? Please help thank you.
 
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