Misfire # 3& 8 random misfires runs rough, kills at stop signs, runs rich any ideas

What is your question?

Runs rough misfires kills when slowing down, codes say random misfires, 3&8 misfiring, strong rich gas fumes from exhaust, both cats removed with exhaust pipe replacing them and back 2 o2sens replaced, replaced cam shaft position sensor and all spark plugs twice and #3 plug 3 times within one month, told timing chain and cam shaft are fine, when plugs were replaced first time it appeared to have oil entering combustion chamber but oil pressure is where it should be, one mechanic thought it may be fuel pressure what should it be at

What makes this problem better or worse?

When it warms up its worse,

How long has your 2007 Ford Expedition had this problem?

Months