7.3 powerstroke missing

[kw110]

2000 7.3 missing when not under load change two injectors that ford said was bad still doing same thing. Replaced the ecm and still have the problem only now its showing more codes that other injectors are reading fault codes any body else run into this

[ToMang07]

First, which injectors and what codes?

Second, has the UCVH (Under Cover Valve Harness) been checked?

[kw110]

# 8 and # 3 was what was changed now it shows # 6 and # 4 with the fault codes and no the ucvh has not been checked