Mileage 170,000

Changed the  Fuel Rail Injection Pressure Sensor,  on the mustang because I noticed it was running ruff prior and was getting code P0191, it ran fine for about a month after that. I did not drive it for a bout 3 weeks after that but when I tried to start it up it acted like it was going to start but it seemed like the engine seized. I used mystery oil let it soak 2 days and it started up fine and drove fine. Next I  changed the oil as it was black. Changed the antifreeze fluid as well.  Tonight driving a short distance I noticed the car running ruff on idle like it wanted to die. Read with code reader and new codes P0196 and P0198 appeared with code P0191. Oil and antifreeze was changed 4 days ago prior to that. Not driving it till I solve the issue. 

David