I have a 2001 ford expedition.
It is bogging down and very rough idle sometimes will cut off . We have replaced the mass airflow sensor and the idle control valve . When I purchased it about 4 months ago, the service engine light was one but it ran fine. When we replaced the mass air flow sensor and the idle control valve the light was reset and it stayed out for several hours even while being driven . Still has the bogging and rough idle . Then all of a sudden the light is back on. Codes pulled are all O2 sensors . Was told the O2 sensors wouldn't cause this...I have no idea as I know very little about vehicles..
Any advice or opinions would be wonderful!
Thanks in advance !