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Well i don't know how fast fuel actually degrades, but if has fuel in the lines, and stale fuel shouldn't make it run like that, it'd still rev higher.
The reason i keep saying afm like a broken record is because the problem changes with RPM, because the RPM is creating the problem you have to ask, what is changing with the rpm? --> Amount of air and fuel going into engine.
So it should be related to engine management systems or fuel delivery, the AFM, TPS or O2 sensor providing wrong or conflicting info to the computer; or bad fuel pressure or injectors (or leak, but that shouldn't randomly happen while a car sits).
But since it started alright i don't think it can be the injectors, and i'm really not sure about fuel pressure, but i don't think that could be it either. So it's kinda left to engine management.
Just my thought process.
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