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what would cause this?
I have 2012 automatic 20k miles with ported blower, headers with hiflo cats,2.38 pulley,blower spacer,cai,tune, all work done by formato. I can't get car to him for 2 weeks as he's busy so I thought I'd try here. My check engine light has come on 5-6 times in past month codes are P0171-P0174 lean bank codes. I noticed the engine light after fueling the car on the last few occasions so this morning with a 1/2 tank of fuel and no check engine light on I fueled up at shell gas station with 93 as i always do. I put 7 gallons in wich did not fill it all the way up but when I started the car I watched the engine light come on. What could be causing lean codes by simply putting gas in car and starting it? Anyone else have this issue? I appreciate any input.
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