N62 - Misfire at Idle P0300, P0301 ect.

[Lexicon740iL]

Hello Guys,

It's been a while since my last post here. My 2006 4.4l sport has been running like a champ until today.

I went for a drive and I pulled up to a light and I get a flashing CEL
and the idle starts to lope. I pull away with a loss in power so I pull to a parking lot, shut the engine off and plug in my Bluetooth scanner and get the torque app up on my phone.

I restart my X and the severe misfire I was experiencing before shut down is almost completely gone and seems to be idling fine. My CEL is still illuminated.

I scan the car and it was showing a P0300 like I knew it would for random cylinder misfire.
I then checked historic faults and see

P0301
2
4
5
6
8
So it logged misfires on all cylinders except 3 and 7

Then I clear codes with it running and instantly the idle goes back to normal and its running like I expect. I get on my way and its running fine. A mile or 2 later I pull up to a stop light and after 30 seconds at idle it starts to flash my CEL and misfire.

Hopefully that's not to much of a novel I like to be as specific as I can in how a symptom is manifesting itself.

Is this obvious for you fellow N62 members on where I should start with this one? I've fixed these symptoms with ignition coils and swapped out hoses and intake plastics on other BMWs in the past when vacuum leaks manifested themselves in a similar fashion.

Where would you start?

Thanks in advance guys!