The symptoms are very confusing, try disconnecting the speed sensor down by the front wheel and see if that makes any difference as that can be the only way the ecu is detecting the car is moving. Why that should effect the idle I don’t know.

Last edited by Rog G; 10/10/22 08:14 PM.
2021 M3W
2013 M3W - Sold
1971 4/4 2 Seater
1934 Sports