Have you tried cleaning the idle control valve which is hooked to the breather tube between the air mass flow meter and the throttle. That can smooth out an idle problem. I would also look at the throttle body itself and give that a good cleaning as well. You may have a lot of carbon built up in the engine also.There is a machine called Motor vac that hooks up to the fuel rail that will clean the injectors,intake valves combustion chambers,exhaust valves even your 02 sensors, If your in an area that has one of these go by and have it done can't do anything but good with the mileage you have. When was the last time you changed your 02 sensors? They are to be replaced at 100m.
They are quiet costly in these cars.
Good Luck
Poolman
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