All good advice in this thread. On my 1983 380SE (euro) I had high idle problems for quite some time. Note that the early Euro ICV's are different than the US versions since there is no vacuum advance at idle on the early US cars so the US versions have to flow more air to idle at the correct speed. This difference presents an opportunity to use a Euro ICV to reduce airflow and hence the idle rate of a US engine. Also note that the absence of vacuum retard at idle due to vacuum retard can diaphragm leaks on the early US cars can cause a high idle. To continue, I cleaned/ replaced the ICV multiple times, replaced the control unit a couple of times with rebuilt, checked for vacuum leaks, etc. without totally resolving the issue. In desperation I finally bit the bullet and bought a new control unit from the dealer and solved the problem. My assumption is that the rebuilders generally do an incomplete job which leaves the current handling/pulsing abilities of the control unit below what is required to maintain the proper idle. Also note that the revision to the vacuum lines substitutes a solid (closed) vacuum line which reduces idle airflow slightly and will in turn reduce the current/pulsing requirements of the idle control system. Mark