2006 Expedition 5.4l hesitation
It is a 4x4 with 80,000 miles, fuel filter was changed 10,000 miles ago. I have second run of injector cleaner through fuel tank, truck is smooth under normal driving, but hesitates under hard acceleration when getting into traffic. The check engine light just came on and stayed on, will take to Auto Zone for diagnostic.
Are the spark plugs regular ones or 100k plugs like most new vehicles?