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Chevrolet Camaro Forum : “Fast idle after running”
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About: 1998 Chevrolet Camaro 2 Dr STD Hatchback
Fast idle after running
When first started hot or cold, the idle speed is OK. After driving even a short time the idle speed is high -- 1900 to 2200RPM in neutral. Shutting the engine down for about a minute then restarting the idle speed is then OK. The check engine light has not been turned on by the condition.
Sounds like a throttle position sensor or idle air control valve. The sensor would reset on restart. It may not be electronic in issue -- the sensor may be "Sticking" like I saw once on my '87 Mercury.