I have a manual choke. I close it for the 1st 2-30 seconds then open it wide. I usually sit and run the car for a minute or 2 before I start to drive it. The 6-pack is a BIG intake and it takes a while for it to warm up. If you are using an electric choke, perhaps it's staying closed up too long. Unhook it and leave the blades open and see how it works.