mine did that once. hasn't happened again. It does dip a bit before settling into an idle after start-up. More than on my 740i anyway. I'm not saying it is "normal" here, just commenting that maybe the 4.6is could be a bit more temperamental than a 4.4i especially on extreme ends of things - given the tuning was done by Alpina for performance, not by BMW for 100% reliable and fool-proof operation under every condition.

That said, mine has always started up just fine even when up in the Sierras and morning temps are typically in the teens or low twenties.

How many miles?

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2003 4.6is - SOLD
2003 M5 Imola
2008 Mini Cooper S
2011 Mazda CX9