A vacuum leak might be worse on startup but should continue to affect the engine after warm up.
I hate to say this, but unless you want to start replacing several $200+ parts one at a time, the best thing to do is to wait and see if it gets worse and then you might be able to isolate the exact cause.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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