Mar 14, 2016. #1. Hi, I have a problem with my 2011 FIAT 2.3 multijet. When the motor is hot, the motor becomes erratic when in idle. I 've been to multiple fiat shops and they all say they can't find the problem because there is no indication in software fault lists. Found also a lot of posts on this topic but not 1 of them exactly the same.
SZHA.