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I would suggest monitoring maf value in grams/second with engine running at idle and NO electric devices on (lights, radio, AC, etc.) Should be around high 3's. Then on your drive look at short term fuel trims and long term fuel trims on both banks. We need to know if you are seeing a O2 too lean or too rich code. Anything over +/- 10% correction will throw your check engine light.
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