1998 Ford Mustang 3.8 V6 lean codes P0171, P0174 & P1151?

I m getting these codes and I can t exactly figure out what is causing this. Engine idles fine. Isn t misfiring or running rough. But it does surge a little bit when driving at about 35 mph. Hasn t died on me once either.

Read more: 1998 Ford Mustang 3.8 V6 lean codes P0171, P0174 & P1151?