2000 Nissan Sentra engine code PO174

This is a lean code and could be a vacuum leak, fuel pump weak,Injectors or fuel filter dirty...can of spray gumout, spray the vac lines and maniflod area, when the idle changes, youve found the leak! You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs!