09 XF 4.2 Supercharged, fine when it's cold, but once it heats up the car starts rough idling and loses power on throttle, new spark plugs, fuel filter, fuel injectors, air filters, even checked for vacuum leaks... Car hasn't thrown any CEL codes or warning lights. Any ideas based on past experience of what could be the cause?

 

What are the LTFTs with hot engine, parked, at idle & about 2500rpm?