Can the high Idle be enabled on an 04. 5 w/ 48RE? I've done a search and read threads. I've also looked at TSB 18-004-04 and the way I read the TSB it can only be done on engines made before 12-10-03 but some people with newer trucks say they have had it enabled. Can someone shed light on this subject? Please, don't ask me to do a search because I've already done that and I'm confused.
Jim

Jim