Duramax Second Generation: 2004.5-2005 (LLY)
So from the beginning i had a surge at idle. It never set a code until it started smoking when it surged. At that point I had p0089 and p0090. I replaced the fpr and the surge is gone. Now p0090 is still on and truck wont rev over 2k. On the scanner my rail pressure reads about 10kmpa and...