Rough Start/Idle Problem

[billdo]

I have been having this problem with my 3.0 X5 the last few times I started it. The car is now a garage queen. It is not a daily driver and I drive about once a week. It is in great shape.

When I start it for the first time in awhile, it is real rough for about 2-3 seconds. Occasionally it will die. Then it idles at about 1200 for a few seconds, and then it is normal. I drive it and it warms up and the problem does not show again until the next time I start after sitting for a week.

Anybody seen this before? My thoughts are it may be fuel related. I have never changed the fuel filter. I rebuilt my DISA only a few thousand miles ago, so I doubt that is it. Is there an idle control valve on these? I know the throttle body is it second.