90 Century codes 14, 22, 43

[Kathy P]

Hello! About 3 weeks ago, drove my car to work...fine. Went to go to lunch, and it died right after I started it and the Service Engine & Temp lights came on. I checked the coolant & added about half a gallon.
Since then, it is sometimes difficult to start or dies a lot, until the temp is up. Sometimes the engine suddenly revs really fast. Once I'm driving, is ok, but sometimes wants to die at stops, again probably when cold.
I took it to a garage for a "winter check". They told me I have a small hole in my radiator near the top radiator hose, and my battery is 5 years old, and I could probably use a tune up and an air filter (all for only $800). I didn't do that because my car runs fine a lot of the time, and right now I just want to get home for Christmas.
I did the paperclip trick and got a code 14 (Coolant Temp Sensor), a 22 (Throttle Position Sensor), and a 43 (TPS or Knock Sensor??). I replaced the Coolant Temp Sensor, and 14 and 22 went away. Any suggestions on what to do next??? Someone told me my car doesn't have a knock sensor??? Please Help!!!!!