Engine Idles high

Hello I have a 1989 Pontiac Tempest and it has a 2.2l 4 cyl. I just recently changed the motor and now it idles high. I put the engine code reader on it and it show 3 different codes. the first code is a 2..2. That code is for the TP sensor.My haynes manual says a code 22 is TP sensor or circuit-voltage low. The second code is a 3..3. it is MAP sensor signal voltage high or Mass air flow sensor(excessive air flow indicated). As well as a code 4..5. It says O2 sensor or circuit-rich exhaust detected. I am looking for help to figure out the problem. I dont know where to start and I cant afford to buy the sensors brand new. So if any one has any idea how to fix my problems your help is much appreciated.