I had those codes and found an intake leak on the oil fill tube - got it fixed but the light came back. Took it to a shop and got it smoke tested for leaks. Found a small leak but that wasn't it. Bought a Durametric and started tracking fuel adaptation. Finally I found someone who knew what the figures meant. They implied a bad MAF. I got a new one and totally fixed the problem. The Durametric shows normal values now. My point is normally I'm not the kind of guy to throw parts at a problem but in this case a new MAF was the cure.
You might want to get your car smoke checked for vacuum leaks first. Fix those and if no improvement you might need a MAF.
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