How do you tune a holley carb? I know the idle screw but I have never had to tune on a holley. Right now I have a holley double pumper 650 cfm carb on my 85 camaro with a 355 and no choke. It will run good when its cooler outside but if its warm the car doesnt want to idle and then when it does its idling at 1500 rpm. I want to get it tuned b/c I may be trading this week for a Lifted Suburban.