I have only 2 guesses, 1) bad gas, run that tank empty and fuller-up with new gas and maybe an additive like techron fuel system cleaner.
2) bad MAF, usually about 15 minutes from the car is started the CEL will trigger because the first few minutes the cold engine is running, the MAF isnt being used, I believe the DME is using a preset fuel map until the engine is at proper operating temps before the MAF is used for its data... then you get your CEL. Goto AutoZone see what the code is.
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