Trouble with cold start Randomly dies and says "low oil pressure"

What is your question?

Cold mornings my truck has trouble starting. It always starts but cranks much longer than it should. Also it just recently started to die at random times. Engine just shuts off while driving and says "low oil pressure" Twice on the highway and once while stopped at a red light. Also chugs/hesitates when shifting gears while accelerating. Even if it is already in the highest gear on the highway I have already replace the o2 sensor and the throttle body...$900 later nothing has changed

What makes this problem better or worse?

Worse when it is cold for starting issue

How long has your 2012 Ford F-150 had this problem?

Starting issue has been 3 years,