What do I need to fix?

What is your question?

Unsteady idle/stalling, reading codes P0171 P1450 P2195 P2197 P0174 P0300

What makes this problem better or worse?

When I come to a stop, I put one for on the brake and give a little gas to keep it steady

How long has your 2003 Ford Expedition had this problem?

The past few weeks is when the idle started going wacky, the fuel tank vacuum has been on for over a year with no issues. 2/11/2020 only the vacuum and sensors were popping up, now the others are popping up.