Re: 1986 Ford LTD Problem
sounds like you are talking about a LTD II, which was built off the Fox/Mustang chassis. those cars either got a 2.3L 4cyl, 3.8L V6 and a few rare cars in 85-86 got a CFI 5.0L V8 with an AOD.
anyway, about your problem, If the motor will run until you manually turn it off and it doesnt stall, I would guess its a starting system problem. I would inspect the battery, cables and starter. replacing the starter solenoid might be a good idea as they are inexpensive and usually go bad.