It is sometimes difficult to determine exactly what is wrong with the 7.3L engines. Many times it is hit and miss for the do-it-yourselfer. It sounds like you are getting enough fuel at first and then fuel is being constricted. For a simple fix, you might want to try changing the fuel filter. It could also be that the fuel pump is worn out and is not providing enough constant pressure. It could be that pressure is escaping from worn out o-rings around the fuel injectors, a moderately expensive repair, about $200 for only the 8 o-rings. If the culprit is the Injection Pressure Regulator solenoid (IPR), it is a fairly simple repair that anyone can do with the right tool and the skill to change a spark plug. I found an IPR online for about $160. I hope this helps, if not come back to FixYa and I will be glad to assist you further.
Answers & Comments
It is sometimes difficult to determine exactly what is wrong with the 7.3L engines. Many times it is hit and miss for the do-it-yourselfer. It sounds like you are getting enough fuel at first and then fuel is being constricted. For a simple fix, you might want to try changing the fuel filter. It could also be that the fuel pump is worn out and is not providing enough constant pressure. It could be that pressure is escaping from worn out o-rings around the fuel injectors, a moderately expensive repair, about $200 for only the 8 o-rings. If the culprit is the Injection Pressure Regulator solenoid (IPR), it is a fairly simple repair that anyone can do with the right tool and the skill to change a spark plug. I found an IPR online for about $160. I hope this helps, if not come back to FixYa and I will be glad to assist you further.