Hello broke college student here that would rather learn how to fix a car than take it in.
04 convertible mustang V6 showed p0461 OBD code initially just causing the gas gauge to fall to empty only on the last quarter tank. I just filled up at that point and left it.
P0316 and P0303 showed up after i experienced a loss in power and rough idle. I replaced the spark plugs, wires and even the coil pack. Problem came back so i replaced the MAF sensor. and it came back again. I then replaced my fuel injectors and the car ran fine for about 200 miles before the problem came back and almost worse. Complete loss of power when going uphill its embarrassing (barely pushing 20 mph when flooring it) and some loss of power when accelerating on the freeway. There is definitely hesitation and jerking when driving at some higher speeds and the car changes gear.
After some research im guessing it could be the fuel pump/sending unit or FRP sensor. I am trying to save money so any recommendations would be great on how to diagnose or what the issue might be.