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I'm not sure what you used as search terms, but there are a lot of threads on cold idle surge, likey due to a (cold engine) rich mixture. You need to check the control pressure regulator's (WUR) pressure specs for your engine.
A way to verify this is to slightly lift the air flow sensor plate while this surge is occurring. If the idle speed drops, it's a pretty safe bet the mixture is too rich. Then use a pressure gauge to verify. Lots of info on this subject on this forum.
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Jim
www.jimsbasementworkshop.com
(CIS Primer for the 911)
(73 911T (RS look) coupe)
(Misc. 911 Parts for Sale)
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