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I had some codes and totally fixed it with a new MAF but I don't know if that's going to fix your problem. You could get a smoke test done where they inject smoke under a slight pressure into the intake system and thereby find elusive vacuum leaks. An independent garage did this for me and only cost $75. They found a couple small leaks but it was really the MAF sensor on my car.
Another thing you can do is buy the Durametric diagnostic unit and look at the actual values coming from the sensors. It was only after I bought the unit and posted a thread on another forum that I learned the values were goofed up and thus pointing to a bad MAF. You're going to want the Durametric anyway if you intend on keeping the car. The Durametric doesn't tell you what the numbers mean but sometimes you can get help online on the Pcar forums interpreting the results.
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