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1997 C4S, Rough idle when warm

Engine

Vehicle Information: Year: 1997; Body Type: Coupe; Total Mileage: 59000;

I have recently purchased a 1997 C4s and I have reviewed with interest your responses to past questions about seemingly similar questions about rough idle when the car is warm. My car starts and runs quite well. The idle when cold is notably smoother than when the engine warms up. I have records from past owners showing all services and proper maintenance through 45,000 miles. The past 18 months of service are a bit of a mystery although everything looks like it was receiving at least periodic, proper attention. Is there a common denominator to the answer to similar questions about rough idle on these cars? The car runs so nicely and does not set off any codes. The oxy. sensors pre-cat look shiny and relatively recently changed. The ISV is clean with slight galling only. I have read all of your old posts on these questions. Looking for a common thread to save some time and money in the fix without throwing a bunch of parts at the car to see what works. thanks for your time and efforts. State: ORTotal Mileage: 59000Car Use: Street use only

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