Hello colleague, i have read post ( http://forum.e46fanatics.com/showthread.php?t=783754&highlight=spark+plug+socket) about your troubles with your car. I'm in the middle of something simmilar to your problem. I have change so many things (CCV and hoses, intake/exhaust camshaft sensors, all filters, cleaned all - ICV,TB, change Spark plugs) but the car does not run like it should run (sometime it runs but it's rare and then it runs realy fine for 320i :) ). There are no error codes (INPA /GT1 softs). Did you ever find solution to your problem. I'm wondering about O2 sensors or ignition coils ???
Best Regards,
Georgi
Best Regards,
Georgi