Transmission Failure problems of the 2010 Dodge Caliber

My vehicle has a manual transmission. In January 2015 the transmission failed and the powertrain was replaced. After that, when shifting, occasionally the engine would rev as if I hadn't taken my foot off the accelerator when depressing the clutch and it was impossible to shift. Sometimes the vehicle would speed up on its own and other times it took forever to get the car up to posted speeds. The occasional engine revving became more frequent as the winter wore on as well as the fast/slow acceleration making the car's performance unpredictable and unsafe to drive. I took it to the dealership a second time and they diagnosed "throttle body failure" and replaced it. This cost me $572. 68. I have now had the car back only a couple of days, but am unsure if this will happen again. Online there are a lot of complaints about throttle body failure in the Dodge Caliber. This is a huge safety issue that needs to be addressed before someone is killed or injured by an uncontrollable vehicle.