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Mike,
As JFP stated it could be any of the components in the SAI system.
Often it is carbon build up in the pump "vanes" that could be cleaned during a DIY pump disassembly/rebuild. (Probably not if you are not mechanical)
If you hear/heard a sound like an angry high pitched vacuum or a saw cutting through thin sheet metal for a minute or so after a cold start it is likely the pump itself.
The pump lives next to your left knee when you are standing looking into the engine bay. It is held in with 3 screws a connector and a hose. All are very easy to access. So a pump change is not a hard DIY.
On a cold start a dealer tech should be able to diagnose a bad SAI component in a few minutes with the PIWIS computer.
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2013 991.1 Carrera S Cab
2004 996 Turbo CAB X50 sold
2003 996 cab 6 speed Sold
1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold
DE instructor since 1985
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