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Hope you don't me chiming in, but it's a good thing that you check fuel pressure reading while the lean problem is there.
I think you should focus on you lean condition under load first, as it is more likely causing it to break up, seems more likely to be a fuel delivery problem when it's only lean under load, compared to ignition. Do you know if the ECM is storing any fault codes?
Although the MAF seems reasonable to swap out. Maybe a good idea to swap out a set of known good injectors and check the ECM grounds for any rodent damage since the car was sitting for awhile. Since you changed out the fuel filter and verified fuel pressure already.
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