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fuel trim

  1. Naturally Aspirated
    02 Regal LS w/ 270k miles. Started to see the mileage decline and noticed that STFuel trim would bounce around -3.1% to +3.1%. LTFuel Trim would run 10.8 - 16.1% and sometimes as much as 20% when in 90 deg.F weather. Car was a bit sluggish at times, but no codes were set. Mileage dropped from...
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