1998 Ford Windstar Emissions

P0174=system too lean bank 2, can be a vacuum leak, weak fuel pump, injectors. Start with the vacuum leak:

You may have a vacuum leak, get a 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! If that doesnt do it, This can be a fire hazard if you spray onto the hot exaust manifolds.