Ford explorer 1996 code po171?

Clear code runs great. Check eng. Light runs ruff and sounds like its missing.

Anytime you get a code that says its running lean and you also have a rough idle and misfiring, its most likely caused by a vacuum leak.Let the engine idle, spray carb cleaner around every gasket, vacuum hose, and vacuum operated component. If the engine idles up, down, or the engine stalls you have found the leak.Repair as necessary. The pcv valve and its hoses should also be checked for leaks and clogs.A faulty ignition component can also cause rough idling and misfiring too so check ignition parts if you don't find a vacuum leak.Spark plug wires, distributer cap, rotor, pip sensor inside distributer, coil, and ignition module. The oxygen sensor reads how much oxygen is in the exhaust and a vacuum leak causing extra oxygen to enter exhaust system. The o2 sensor reads this and signals a lean signal.It can also cause the smell of fuel to be pretty strong because the computer richens the fuel system in an attempt to get the air fuel ratio back in spec. An exhaust leak is also considered a vacuum leak