Good evening , I have the following problem with my k12 1.4 88ps Bj 2003. He sometimes has in cold condition idle , such a jerk , as if the engine is going out any moment and there is a speed fluctuating from 500-1500 . As soon as the engine is warm , everything runs wonderful . And there is also no error and the car does not go out . The camshaft sensor was exchanged in April this year . Now at the beginning of September the steering chain was changed . Picked up & drove for half an hour, again the engine light lit. As a result a mistake was read out with the lambda probe and then it was exchanged. Tomorrow we have the spark plugs renewed, because I had bought the car this year used & we do not know when this was last done. Did you vlt make similar experiences with your car & found out what it was about to jerk this ? I ask for your help! Thank you!