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There should be an idle setting on the side of the rochester carb.
there is a set screw on the linkage on the carb that will adjust it.
If you are not able to adjust it down with the idle adjust knob you may have an airleak at the carb.
twist the screw under the carb
there is a screw on the carb. be sure to adjust while the engine is running so you can tell by the idle when it is set properly.
Start at 1 1/2 turns from "seat" position and adjust each screw equally until you get the best and smoothest idle
It should be on the carb!
If it is throtle body equipped, the idle control s solonoid controls it. If it has a carb there is an adjustment screw on the bottom of the carb.
there is a little screw on the back of the carb. if you loosen it, it will idle slower, tighten it, it will idle faster.
there is a screw on the carb right where the throttle cable hooks to it that you use to adjust the idle.
Adjust the throttle stop screw located on the side of the carb that has your throttle linkage connected to it.
adjustment screw is between throttlre linkage and carb body on the right side of the carb as you stand at the front of the car looking at the carb