Hit the apex today. I am at 4000 feet above sea level. Always struggle with my carbed "65 GM. Jetting, timing, valve adjusting etc. If the humidity changed 5%, would have to tune once again.
Today, I did not do anything for the G except to turn off the VDC.
Temp equal 5 degrees C or 42 degrees F. My car hooked up and ran like never before.
We are colder than a witches tit up here, and something has to be said for that. Cold air for crying out loud!
Unless you are ramming cold air somehow down the runners, then fugetaboutit!