I have a 1979 corvette and I have bored it .30 over, shaved the heads 20 thousandths, and I have a .488/.488 cam. The quad came stock on the car and when I try to kick in the 4 barrel it doesnt automatically kick in. The car almost dies. If I am running about three thousand RPM then sometimes it will just kick right in. If anyone has any idea of how to fix it it would be greatly appreciated.