Low oil pressure light keeps coming on and it turns off when stop at a red light on 2004 Ford F-150

My truck, the f150 is giving me problems. Last thursday it wouldn't turn on. So i got someone to jump start it. It worked. So when i got home that day I switch the ford expedition battery to the f150 till I buy a new battery for it. The problem now is that when I stop at a red light and i'm slowing down the engine turns off, and it beebs and tells me low oil pressure. Does anyone have an idea what the problem might be?

1 answer 1 comment
Yes , the engine is stalling , that causes a loss of oil pressure , then the oil pressure sensor/sender causes the light to come on. Is the check engine light on....WHILE the truck is running??
The check engine light does not come on