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The engine idles faster than usual by more than 500 rpms. Replace what part?

(1990 Pontiac Bonneville)
in Webster, TX on January 15, 2015
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on January 15, 2015
Ck throttle body gasket leaks drawing air"sucking air somewere"
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on July 01, 2015
probably need to change iac (idol air control) sensor or map sensor, or throttle positoning sensor.
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