Idle Rpm Fluctuates: Prelude

Check idle speed adjustment. See ON-VEHICLE ADJUSTMENTS article.
Check Idle Air Control Valve (IAC). See appropriate Diagnostic Trouble Code (DTC) in SELF-DIAGNOSTICS - PRELUDE article.
Check Fast Idle Thermo Valve for proper operation. See SYSTEM & COMPONENT TESTING article.
Inspect/adjust throttle cable. See ON-VEHICLE ADJUSTMENTS article.
Inspect throttle body for sticking and binding.
Check for worn throttle body.
Check for intake system air leaks.