need help/it aint my 96 ranger

[joe]

2003 sport trac, need to change 02 sensor and fuel filter ''both banks running lean'' where do i unplug sensors and any advive or tricks would be great,

 

[Ranger44]

It coud possibly be a bad O2 sensor, etc. But I'd really look for simple things first. Is there any unmetered air entering the engine?

This could be anything from a crack in the intake hose(behind the MAF), a leaky vaccum line, or leaky intake manifold gasket.

A good test is spraying carb cleaner around these areas and see if the rpms go up slightly. This would indicate a leak and help locate the problem area.