2008 Audi Other

Engine Mechanical problem
2008 Other Audi Models 6 cyl All Wheel Drive Automatic 3000 miles

my Audi Q7 S-line have following problem :
when warm engine (after driving one hour ) stop in stop sign, my foot still in brake. Than rpm up& down
between 900 to 1100. Engine runing was high & lower ( transmission still on D position ), what is problem for my Q7?
December 19, 2008.

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