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If the car is fuel injected, the Idle screw is on the throttle body either to the left side or near the butterfly (Intake plate). If not keep in mind that he idle screw has to be near the Intake plate in order to adjust the idle. If it is carburetor, than the idle screws are on the front of the carb, in the middle.

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Q: Where is the idle screw in a 1984 Buick Century 3.0 V6 Custom engine?
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