So my lady and I were on the highway today making our way up a 20-30 degree incline when the car started bogging and struggling to stay operational. We barely made it home by lightly applying pressure to the throttle only when necessary. When pulling into our apartment complex parking lot I noticed that the car didn't have a problem accelerating anywhere below like 15-20 mph. Recently i've replaced the alternator because the throttle pedal wasn't getting enough power along with other accessories in the car. There's also been a recent code for the Catalytic and I have yet to fix it. I was told to replace the whole Cat but i've been lazy. Any help would be really useful and if I should replace the whole Cat please let me know!