Not sure what's on that particular model , but you could check or clean idle control valve / stepper motor . Or maybe this reset procedure for the Laguna might work
Idle Valve Reset Procedure
When fitting a new idle valve, ensure that the internal throttle housing is cleaned well.
Once the new valve has been fitted, switch the ignition on, DO NOT start the engine, leave for 10 seconds, turn ignition off, repeat 3 times.
Only then, start the engine and take for a drive.
If you follow the above procedure, chances are all will be well, problem solved!
Best I can do to help .
Posted Sep 23, 2010 (14 years ago)