98 ford expedition problem code P0171 P0174

1998 FORD EXPEDITION
160,000 MILES • V8 • 4WD • AUTOMATIC
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1024QUINTANA
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I got a 98 ford expedition and the check engine light came on and the guy at auto zone check it and the code was p0171 and po174 I think he told me to check all the hoses but I couldn't find anything so I call my father and he said it might be the fuel injecters and nowthe car engine is shaking acting like it's about to die like if I was running out of gas
Mar 16, 2011 at 4:33 AM
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RASMATAZ
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Lean fuel condition could be caused by one of the following below:

1.Vacuum leaks
2.EGR and PCV valve.
3.Low fuel pressure.
4.Dirty fuel injectors.
5.Mass Air Flow Sensor.
6.Oxygen Sensor.
Mar 16, 2011 at 5:11 AM