Hello, I'm Jason. I will do my best to answer your question quickly and accurately using the information you have provided.

hello there. How many miles are on the car?

while I'm waiting, you're going to need to check for vacuum leaks using an inert smoke generator. Also, if you're starting to see any oil smoke on cold starts, it's very likely that you will need to start by replacing the air/oil separator on the rear of the intake manifold

this is the typical cause of lean running codes....

and if, while the car is idling, and you try to remove the oil cap, and you experience a lot of vacuum, this is another sign of a failed separator valve

if you do need to replace the valve, it's best to remove the whole intake, as the torx bolts holding the separator on will typically strip if you attempt to remove them with the intake in place

correct. This picture is from a '98, but very similar

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Another view:

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And finally, what it looks like off the intake

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If this is the problem, I also recommend a few set of intake gaskets, the front intake cover gasket, the tube that goes through the center of the intake, and the vent tube that runs just to the inside of the left cylinder bank, in the valley

that would have been helpful information in your initial question. Possible, but not likely

you could also have a failing air mass meter

could be multiple problems, but the two I've indicated are the most common. Any diagnosis beyond that is somewhat beyond the scope of this format