I have a Holley on top of my 350 which I have not touched for months. Since the cold weather (30+ degrees cooler) has moved in, my truck seems to run a lot stronger and better. It never had the added umph it has now.
My guess is that my mixture has been too rich, and now with the colder air, it's somewhat leaned out, making the additional power. I now have a occasional slight stumble off idle, leaving me to believe I need to up the shooter a size.
Anybody have any theories, positive or negative?