I am trying to help out a friend of mine. His EGR cooler started leaking so he installed a sinister diesel EGR delete kit. The truck threw the usual EGR codes and went into a fuel limp (wont go over 2000rpm). I efi live tuned the truck shutting off the EGR codes hoping that would help but the truck was still in a limp with no codes. Has anyone had a similar issue or have any ideas what could be going on?