91 grand marquis shuts off while drivin?
 

I have a 1991 grand marquis 5.0 gs
and recently it shuts off while driving no knocking or anything just shuts off like a switch but right before it shuts off the oil light comes on and it has a good amount of oil although it needs to be changed and the car runs beautiful it sounds great but im really at a loss here i was wondering if anyone else has had this issue and what they did to fix it

Does it start up ok?

Not so much
 

not after it shuts off it takes a jump to start back up and latley it wont start at all it trurns over but nothin the battery's good and i changed the solenoid and the oil pressure switch and the oil and filter still nothin