im not much of a carb guy at all but im having this odd problem with my car.for some reason it breaks up between 3500 and 6k rpm,under load or just in neutral .if you try and hold it at say 4 the break up is pretty bad.this sucks because i can't launch the car on slicks because it breaks up right where i need to be launching.fuel pressure is good and my ignition is good,its an msd brand new.any ideas.its an edelbrock 600 bolted to a victor jr on and otherwise stock motor.