i am having a lot of trouble with my 1996 f350 7.5. for a while it out of know where it would just die random. i never thought anything about it until it died going down the highway. i park it for a little bit to get some money together for it. Now that i got money i replaced the fuel pump. coil and also ingnition mod. today i got it running let it run for half and hour shut it off thought it was fixed 2 hours later came back and wouldnt start. any help would be awesome

 

Why did you spend that much money on parts not knowing if the old ones were good or bad?
Sorry I have always wondered why a guy would do that.

1) You more than likely replaced the good Black Ignition Module with the wrong Gray one so it will not start and run as well and have poorer gas mileage than before. From 1994 and newer trucks you always use the Black one as your truck is not wires right for the Gray one. The Black ones very seldom go bad so put the old one back on with lots white thermal compound and not dielectric grease.

2) Before changing the Fuel Pump you need to put a gauge on the fuel rail and see what it says when the engine dies. First check to see if you hear the fuel pump run when you first turn on the key. It should run for one second and quit. If it does not run at all see if the fuel pump relay clicks when the key is first turned on and clicks again (drops out) one second later.
Or does the fuel pumps run all the time the key is on and the engine not running?

3) The Ignition Coil very seldom goes bad anymore as it is no longer oil filled and they seem to last a long time.

The two items that cause this most of the time are the PIP sensor and the PCM Computer.

But you need to find out what is happening before changing any parts as you can replace good parts with bad ones.

You need to find out first if you have a fuel problem or a Ignition Problem.

1. You can start by checking the codes and see what they tell you. This may tell you what part is bad and needs changing.
If you do not know how to check for codes on your OBD-I system go to the link below:
Ford Fuel Injection » How To Run a Self-Test

2. If the codes do not help then get or make a spark checker and check for spark when it dies. If you have spark check for Injector pluses with a Noid light.