1999 Saturn SC2 High idle RPM

1999 SATURN SC2
112,345 MILES • 4 CYL • FWD • MANUAL
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SOFA4
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i replaced the IACM. After the install, the RPM stays at approx 2000 while the care is moving,but soon as the car stops the RPM will drop to around 1000. Why does the car moving have to do with the idle speed?
Nov 1, 2009 at 8:45 PM
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