Hey guys former mechanic care for Ford I have a question regarding these 3rd Gen. 5.4 guarding these 3rd Gen. 5.4 expeditions I have I have replaced the catalytic converter although I did not do a back pressure test oh I did not do a back pressure test I'm having an issue where at idle I'm an issue we're at idle especially when on an incline the engine design I'm the engine decides to idle down real low as if it's trying to it's downroll low as if it's trying to die and has died it's stumbling Are there any mechanics out there that have figured this problem out if this problem out it is not the catalytic converter as it possibly pieces is it possibly PCM camphaser let me know