It could be as simple as a severely clogged fuel filter.
There are a few things you can do without touching the fuel filter to confirm if you have a DSO.
You can simply see how many amps the fuel pump is drawing to start and then look for a lean condition at a wide open throttle through a 1 – 2 shift while monitoring the LTFT to confirm.
The LTFT should remain in the high digit positive and both up streams should stay +800 mv.
The fuel pump amp draw should be respective 6-9 amps or so. 10 amps and higher would raise concern and I would suspect the fuel filter.
Or you could just crawl under it, remove it, and then try to blow through it to confirm.
I prefer hooking up a good DSO and scan tool to make a diagnostic decision then make some other grunt change it. Makes em real happy and wonder how the hell I did that without ever racking the vehicle or screwing a pressure gauge on itW;)