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1993 964 C2 Tip - Searching Idle when Engine is warm

Engine

Vehicle Information: Model: 964 tiptronic; Year: 1993; Body Type: Cabriolet; Total Mileage: 53008;

I recently had the car in to fix a searching idle problem. The shop found faulty Oxy sensors, which were replaced. The car performed flawlessly after the new Oxy sensors where installed. However, since today I have the searching idle problem again, but only when the engine is warm. After starting the engine in the cold state the idle is steady.What can cause that problem?

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