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.

1998 ford mustang 3 8 v6 lean codes p0171 p0174 amp p1151

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