What engine do you have, V-10? It could very well be a vacuum leak, check the hose that goes to the brake booster, follow it back to the engine. That hose sometimes goes to a "T" fitting and there are other vacuum lines that go off of that, follow those too. Also check the PCV valve on the right hand (passenger side) valve cover, there's hose on that too it could be a faulty PCV valve too. Throttle body gasket or intake manifold gasket are also possibilities. If it's the Diesel engine, I guess I would start with the fuel filter. Does it start hard hot and cold? If it starts hard cold and smokes a lot you may have glow plug issues. On either engine I guess there could be a sensor that's going bad, are you getting a "Check Engine Light"?
It could be the "Injector Drive Modual" which is located on the left inner fender by the hood hinge. But, before you replace that you should check all the wire connection for the glow plugs and injectors. Where the wires go through the valve cover gasket, if those connection are all burned up and melted together, it will burn out the injector drive modual. I hope I'm thinking of the right engine, there should 4 connectors 2 on each valve cover, there are 4 more connectors inside the covers 2 on each side. Remove the valve covers and check them all. The injectors operate on high voltage and the glow plugs on low voltage, if they short circuit together it will take out that modual and you won't get any codes. You may want try and find a used one at a juck yard (car-parts.com) because the are kinda spendy from Ford, I think they have reconditioned ones available too.
Symptoms are starts hard, runs rough, smokes a lot, stinks like unburned fuel.
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the engine is the 7.3 diesel. it is hard to start hot or cold. it hasn't given me a code on a hand held scanner. it has no power even after it gets to operating temp. a fan belt broke a sensor on the front of the engine. i replaced it but still din't help any.
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