Darren Fargo

Hello my SAVIORS. ( I hope) I have a 305 TPI set up. In the summer car wont idle till it is warmed up. Then I shut it off and restart. It runs perfect after that until I shut it off and it cools down. Now winter is here and it will start easy but runs about 2000rpm for 60 seconds then when it trys to idle down it dies. when i restart it runs really rough and blows black smoke like it is really rich. I have changed the temp sensor but no change. It shows these codes, 15 (coolant temp sensor circuit fault or High voltage) I have changed this sensor. Code 21 ( Throttle Position Sensor- High Voltage). and code 33 (MAF sensor -system voltage high during idle).
I hate just replacing parts PLEASE help if you have had similiar problem.
Thanks