Quote Originally Posted by kur4o View Post
I suggest you load the latest cal from GM, unmodified and start tuning from there.

There is a service bulletin about the 3-2 clunk which I actually had long time ago and the update fixed it.

Here is some more info

https://tis2web.service.gm.com/tis2w...1&bm=_top#_top
Got an E4214 error trying to open that link. Is there a browser setting i need to manipulate to make it open? This laptop is a bit clunky itself...