Do you want to adjust the idle up or down? If your car has too high of an idle, you probably have a vacuum leak. buy a can of starting fluid. Start the car and lightly start spraying starter fluid all over the intake. You will hear the engine change RPMs. When it does, that is where you have a leak. If you want to idle your car up, you will need to adjust your throttle plate. Where your throttle hand moves when you rev your engine, it has a little screw that you can adjust to make the throttle arm stop sooner, allowing more airflow into the engine.
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