I have a 2004 6.0 bone stock (except for upgraded Ford headbolts) with 200k miles and I recently had to have all 8 injectors replaced as well as my fuel pump. I am suspecting other issues such as my ficm because I still have symptoms when it is cold.

My symptoms include:
My idle is still rough until my engine is at normal temp (cold only)
I still have a weird vibration noise at idle (no matter the temp)
I have white exhaust until I get it past 2000 rpm then it is normal (cold only)... The colder the air temp, the thicker the smoke until engine warms up.

If anyone knows what could be going on/what to do to fix it please let me know.

Another thing I can't say if its an issue or not but when my injectors get done buzzing before firing my engine up, I hear a slight thud. Is that normal?

Thank you

 

That thud is normal, it is the brake system, there is a pump that works when engine is off so you have enough brakes to stop in case the motor quits. I doubt you had all 8 injectors fail at once, when all of the sudden you get codes for mny injectors it is always a failing FICM, you have the classic systems of a wak FICM, there is a test procedure at top of the 6.0 section on how to do one, Also it is a good idea to upgrade the fuel pressure spring to the "Blue" spring. low fuel presure is the leading cause of injector failure, even though you have a new pump you might not have the proper presure.