Cold Fast Idle Too Low: Civic

Check Idle Air Control Valve (IAC). See appropriate Diagnostic Trouble Code (DTC) in appropriate SELF-DIAGNOSTICS article.
Check idle speed adjustment. See ON-VEHICLE ADJUSTMENTS article.
Check Intake Air Temperature (IAT) sensor circuit. See appropriate Diagnostic Trouble Code (DTC) in appropriate SELF-DIAGNOSTICS article.
Check air cleaner element.