I am trying to tune my 600 cfm Holley 4 bbl and am not sure if I am doing it right. I have set the secondaries and choke Idle (??). I started by turning in the mixture screws JUST until they seated. I then fired up the motor (1000RPM) and started turning the screws clockwise. Nothing changed! RPMs, idle all stayed the same. I thought maybe I was turning the wrong way, so I started turning clockwise. Only after I got both screws seated, did the RPMs drop. Is the choke idle or secondary idles set incorrectly?? Please Help!!