7.3the Big Short -

Dirty injectors or faulty idle air control valves can occasionally cause rough idling or hesitation. Ownership Experience

For those who want a capable workhorse without the complexity of DEF or DPF systems, the 7.3L is highly regarded, though it requires a tolerance for high fuel costs. 7.3The Big Short

Some speculate that low oil pressure at idle (as low as 8 psi by design) may contribute to these failures. Dirty injectors or faulty idle air control valves

While marketed for its longevity, some early owners have reported significant internal issues: the 7.3L is highly regarded