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I have a 350 Super Duty Dually 6.0 that just sits because I am afraid she won't start if I go somewhere....Here is my problem,sometimes it starts and some times it doesn't.When hooked to computer it reads no codes.I have replaced EGR valve once approximately 1 yr ago,and recently had it cleaned.People are telling me to put a delete kit on it.Does anyone have any input?
A bad EGR valve should not cause a no-start. So I don't think that is your issue, and discussion of an EGR delete should wait until you have the issue resolved.
Possible no-start issues include low fuel pressure, low oil pressure (HPOP or a related component called an STC fitting), FICM, injectors, and more. Your best bet is going to be a visit to the dealer for a diagnostic.
A few simple questions would be, how long since you had the fuel filters and oil changed?