I drive a 2007 Lexus IS 220d which has covered 17,655 miles. It seems hesitant when I first drive off in first gear, and then the power comes in which makes for a jerky drive. This happens in the other gears too. If I go to accelerate in any gear there's an hesitation for a couple of seconds, then you feel the engine respond. I am taking my car for it's third service shortly, so is there anything I should tell the Lexus dealer? I did mention this to the dealer some time ago and the technician told me its a characteristic of this engine, and I should use Shell or BP's premium diesel - which I did, and didn't make any difference. What can I do?