So just got my coils&plugs and both cats done and she's running a lot better now at low speeds/gears. However she's really struggling after 3rd gear, especially up slight inclines and definitely not getting power after 50-60mph. I'm forced to downshift from 5th to 4th going up even the smallest inclines on highways or my speed will fall with the pedal floored. Even when I downshift she barely manages to maintain speed. My pedal also seems really low to the floor, but my mechanic says I get full throttle so idk. Fuel filter? Air filter? Fuel pump? Anyone have something similar happen and got it fixed?