To determine the causes of this malfunction, special diagnostic equipment is required, therefore, in this case, contact a service station that specializes in repairing vehicles with injection engines.
However, it should be noted that most often this malfunction is caused by a failure of the idle speed controller or air leakage through loose throttle body hose connections. If replacing the regulator (see «Engine management sensors») and tightening the hose clamps to restore idling failed, contact a specialist.