I have an '08 GT that runs like a monster, but will constantly hunt at Idle to the point that it will die. After 3 BMW "Authorized " dealers diagnosed it improperly$$$$ I gained some valuable info at the Ralley in Oregon. The conclusion is that the culprit is the air box; apparently BMW offers an upgrade for certain model VINs at a cost of around $400. plus 2 hours labor. Anyone else with an issue like this?
Your help will be much appreciated.