For starters I’m new here. I’ve looked all over online and I keep getting mixed answers so hopefully someone here has had the same issue and can help me out. I recently bought a 2006 CTS 3.6 with 130,000 miles (got it for $400) I was told when I bought it that they took it to a dealership and...

I've read on here and in the FSM how to jump the ALDL, loosen the dist., and change the timing using the timing light. However, I also saw in the manual that you can go into the diagnostics mode 5.9 (Let it read 7.0, hit HI, it'll read 9.5, than hit ECON and WARMER, it'll read 5.0, then LO or HI...