I have a Ford F-150 1990 with 85,000 miles. Two weeks ago while driving it, it quit completely. It would not restart so had it towed to a Ford dealer. Two days later, the service manager called, said nothing wrong. All the computer diag. checked fine. I went after the truck, and it shut down while driving home, but restarted fine. Took it to work next day, and it stalled and quit in middle of terrible traffic and accidents. ( not mine) After I set along the side of the road, for an hour, it started up. I drove it to the dealer again. Next day, nothing wrong according to the service man. He suggested the fuel pumps in the dual gas tanks were failing, maybe both of then, cost to replace $900.00. But when we start truck, we can hear the pumps running. The service man suggested we run it and test the tanks. So we are. (Got tow truck number down pat.) So now when we run off the rear tank, the truck stops, but we can restart it by clicking on the front tank. Thought that was the problem, we need to replace rear pump, BUT no, while running on front tank, truck also dies, but will restart. Now I don't trust Ford dealer, as they also wanted to do a break job that has nothing to do with running of the truck. At that time they replaced 2 parts, a cont asy-ing multi f and a stator asy (Hall Eff) what ever that is. Cost for parts, labor and diag. 500.00
The following week truck broke down again, this time when we got it started took it to another Ford dealer, and the one we bought the truck from in 1990. They had it for ½ day, said the coil wire was corroded, fixed that and replaced a EEC relay. Next day while driving it to work at 5:30 AM broke down and would not start. Called the Ford Dealer at 7, he had me call a towing co, they took truck in., Today he called and said the computer in the truck is broke, gives them faulty readings, he is ordering a new computer. Does anyone have an idea what this is going to cost me?

 

You stated the components changed but I do not understand the description. They changed the Hall effect sensor and a contact assy? Did they change the TFI IV module?
Sounds like this may be the problem. They have been known to be thermally intermittent.

 

Yes, they did change the TFI module.