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Why would a 93 Honda Civic idle up and down after you rev the car up?
Wiki User
∙ 19y ago
Check the Idle Air Control. It might have carbon deposits and need cleaning. Also do the same for the throttle body intake. It might also need cleaning.
Wiki User
∙ 19y ago
Wiki User
∙ 13y agocheck coolant level, also check for a vacuum leak.
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Idle Air Control Valve.
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