The chase for the cause of the random misfires continues.
After being unable to find the cause I decided to take it into our local European Auto repair shop to have their high dollar diagnostic reader scan the X5.

He scanned the car, found the codes that I have already been dealing with.
Drove it and found nothing wrong. He "reset" the DME billed me $130. Before i got the car home I had several misfires and a glaring SES light. Reaffirming why I never take my vehicles anywhere for repairs.

Back at it again, I removed the DIAS valve again and inspected. I applied vacuum and rigged up a 12volt switch to ops check the valve. Really couldn't find anything wrong with it. I did replace the O-ring with a bigger one. When reinstalling the valve I noticed that the with the new O-ring the valve fit much tighter.

So as for now I have two trips into town (40 miles each trip) with no problems. Maybe I have it fix it with a new O-ring, or the SES light bulb has burnt out?

Ill keep you posted.