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Old 11-15-2009, 03:56 PM   #4 (permalink)
90 GP
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When engine is cold the idle air bleed elevates idle till warm . You can feel strong vacuum in the square port inside throttle body. When warmed up you shouldn't feel vacuum. It is common to get gunked up . Try spraying cleaner in the port. Also coolant passes thru it so if thermostat isn't opening that could also cause the problem as well.
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