[MSoule]

Not sure if you figured this out, but I had a similar issue on my 328i many years ago. I was ready to give up and trash the car, then one day when I had my intake off my dad tried bypassing the PCV valve, and BAM it was fixed. I thought it was the throttle body as well, and even had replaced it same as you. So check the PCV valve or crank case ventilation.

 

[MSoule]

All I can tell you is that I had a cracked PCV/CCV and I was getting similar throttle body codes and had the dreaded EML light and struggled to idle. No disrespect taken. We are all here to try to help. This was just my experience. It couldnt hurt to look into if the issue is still around.

 

[MSoule]

I'm no expert by any means, but just another avenue to check. I also did replace my throttle body but it did not fix my issue, but anything is possible. It was years ago when I went through this, but I believe my dad plugged the PCV and the car finally idled.

Correct me if im wrong but the PCV is controlled by vacuum, so a leak in the assembly could cause fluctuations in the vacuum and impact the ICV.

 

[MSoule]

To give more context on my experience. I was getting the EML light come on after 10-15 minutes of driving and the car would go into limp mode. I would have to pull over and turn the car off and wait until it went away, it seemed that when the car was cold it was less of an issue. It was an extremely inconsistent issue until it became a constant issue that prevented the car from running all together.

on the code read out we got throttle body errors. we replaced the throttle body and the issue remained. it did not resolve until we replaced the PCV