There could be several causes, if your car just does this when it is cold then that is normally usual on decatted cars.
Otherwise:
1. Check the spring on the throttle body. Clean and oil 2. Check inside the throttle body. Check if the flap sticks. Clean 3. Check the throttle position sensor. Disconnect the electrical connector, clean etc. 4. Check the Idle Air Valve Control (IAVC). It sometimes gets blocked so check the hose to the intake side of the throttle plate. Also check the electrical connector and clean if necessary.
You can reprogramme the sensor by:
Leave drivers door open. Turn ignition to II so dash is lit but engine not cranked. Ensure the immobiliser is deactivated. Slowly press accelerator fully 5 times, then turn off the ignition. Wait 30 seconds then start the engine.
5. Check the Inlet Air Temperature sensor (IAT) which is located onto cylinder 4 of the inlet manifold. Green sensor. Check electrical connection etc etc
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