diagnostic code P0171 on 1996 Toyota Tacoma

just wanted to know of any common problems related to code P0171

Asked by for the 1996 Toyota Tacoma
Here is a ton of info about the P0171 Code: http://repairpal.com/OBD-II-Code-P0171-and-P0174
2 answers
look for any vaccuum leaks. that and the pcv valve are the most common.
Roy