Feels like the car is not shifting properly

I scanned my car with a OBD2 sensor I bought at a local Walmart. I am no car guy so I am figuring it out as I go but hit a roadblock. When I am driving my car it is not shifting properly and does not want to go over forty mph. The Error codes I got on my O2 scanner where for the camshaft sensor and the throttle position sensor. I replaced the throttle position sensor and still have the issue. It idles higher than normal as well even after it warms up. If there is anything else I need to provide to help find some answer just ask and I will go get it. I am just trying to get my baby running smooth again.

Much thanks to those who take the time to read.