My car is throwing 2 codes, P0140, which I know because I don't have a rear o2 sensor in, but a new one... p0452? I looked it up and this is what I got.. P0452 Evaporative Emission Control System Pressure Sensor Low Input

Is that the sending unit or what? my car is acting a little goofy, like it's holding back when i go WOT. any ideas?