Symptoms of Bad Idle Air Control IAC Valve Sensor - Does this happen when you stop your car?
Bad idle air control valve symptoms vary but this is one that I've experienced on few occasions.
NOTE: This could be a sign of other issues, but if this happens due to IAC malfunction then changing the IAC can sometimes solve the problem quickly, but it's usually past time to clean the entire throttle body and inspect all attached sensors for a lasting fix. Also, simply removing and cleaning the IAC can sometimes get you back on the road for cheap without having to remove anything else or pay for parts up front.
