Misfire in the mornings

[timx5]

Hey,

Wondering if anyone has any advise on my problem.

I have a 2005 X5, 4.4i. Only 67,000 kms on it. Not every morning, but most mornings when I start the truck, it will hesitate and run rough. A shot of gas will clear it right up, or if you let it sit it will clear itself up anyway.
Every so often it will be bad enough to throw a misfire code.
I've had:

P0300
P0306
P0301
etc.

Dealer hasn't been able to do anything. They've checked the entire ignition system. Checked a service bulletin on the coils and found that they are up to date. They just blame it on poor gas quality in Canada. I always run 91 octane from Shell. I doubt it's a gas quality issue, as other BMW's around don't seem to be having the same problem.

Once the truck warms up, it is fine for the rest of the day. It will only do it again if it has been sitting for an extended period. Atleast 6-8 hours.

Then again, other times you flick the key, and she will fire right up with no problem.

Any advice?