Originally Posted by BoogeyMan'sBMW
did you have a SES light?
im having the same symptoms. When idling, the car sputters/shakes/hiccups most of the time and when i go WOT it misfires. no SES light tho and occasionally it behaves normally
SES light would only come on if i was driving and had a misfire under accel or WOT. but if i turned the car off then on again it cleared the light. And same occasionally it behaved normal. like the funny thing that day to me was i took it to my dealer and as soon as i pulled into the service bay, like no rough idle nothing and had to rev the nuts off the car to recreate the misfire. sounded good tho hearing the PE in a service bay lol but still made me cringe when i heard if misfire. but most likely my friend you have a leak in your valve cover gasket.