Often, a rough idle on a long sitting cold starts is due to slowly leaking injectors. The residual pressure in the fuel rail causes fuel to slowly drip into one of the cylinders. This causes a too rich condition for ignition in the effected cylinders until the extra is blown out the exhaust. Then it smooths out.
You’ll smell unburned gas frm the exhaust on startup.
Diagnosis is to wait for 12 hours, or so, for the condition to set, then pull plugs and see if they are wet. Or stick a wooden pencil in the plug hole and see if it gets fuel on it.
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2005 X5 4.4i SterlingGrau, Sport Package, DSP
Build 3/12/2005
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