slighly choppy engine idle

i'm getting a very smooth idle that just occassionally stutters pretty deeply on the tach. i just did a 40,000 tune up and everything is in good shape. is this just the result of an aging engine, or might it be
indicitave of a greater problem, such as sticky valves, bad spark plug wires, etc?
i have a 2002 a4 1.8t.
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On 10 Oct 2006 05:39:32 -0700, " snipped-for-privacy@gmail.com"

Or an ailing 02 sensor or MAF or an air leak or a dodgy coilpack?
Have someone use a code reader to see if the ECU has logged any out-of-scope faults and start from there.
/daytripper '00 s4 6spd
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Check your vacuum lines for splits - even the very small ones.
I.
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