The case relearn didn't really help it out as much as I thought. But there is a passlock relearn and a case relearn. The passlock you can do yourself.hi
have a 2008 ltz with 3.9 w/ fuel management system ? aka 3 cylinder mode with 70K miles and looking at getting the overkill ECM..
was wondering about the relearn process you are talking about..
what was the process and how long did it take.??
how has it helped with power and MPG.. i was looking 87 octane model.