My guess: old and brittle plastic/rubber parts such as an idle valve or other pieces that when cold, do not let air in, but when warm expand.
Haasman
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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)
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