no i haven't.
Many people who have them (myself included) have had good success and noticeable improvement in "driveability". Not saying its going to fix your idle issue but it will certainly address the surge you're experiencing.
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no i haven't.
Did I miss something in my assessments? I did everything that should possibly have been done. Including new spark plugs, new air filter, cleaning out air box, torque the heads, injector test spray. It runs smoothly on the road yes, but the idle stutters a bit and there is the BMW surge aspect which doesn't bother me much. anything else I can do? thanks!