Trouble Code Help for 87 Cutlass

[WIKD CUT]

Car has been running rough ever since I pulled the carb off and had it rebuilt. Finally pulled the trouble codes today and got 21 and 4 or 44. I tried to find a chart that shows the codes but I can't seem to be able to download one. Can anyone help me with these codes???

 

[FE3X CLONE]

This is what I found after a quick search:

21 TPS voltage was above 2.5 volts for 8 seconds when the MAP sensor signal showed manifold vacuum to be 15 pounds or more.

44 Oxygen sensor voltage was under 0.2 volts for 50 seconds of closed loop operation.