Quote Originally Posted by Snarf77 View Post
I got a new (custom) tune in my email this morning. I'll first add the tune tonight and take her for a spin and probably run a few logs for the record.
Don't form a final opinion of the new tune until you drive several days. Every time a new tune is written, the long-term fuel trims in the computer are cleared out. It takes a while for the computer to adjust the trims again, and the result can be that it drives quite a bit differently a week later than it did the first day with a new tune.