I have a 850dp on my 455 olds (rebuilt carb, rebuilt motor). The motor runs good and the spark plugs read right on after running it but when I get into the throttle wide open it has a bog to it, but if I let off and hammer it again it picks up with no bog. I have changed out the secondary jets to larger ones to try to solve teh problem but no luck. I dont know if I need larger discharge nozels or what? Any Advice would be appricated.