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<e30> Wandering idle



I have a problem with a wandering idle on my 1990 325is.  This happens with
a warm engine - the idle starts to drift from 500 to 1000 rpm in a rythmic
manner.  Normally, the idle was solid at 750 rpm.  Had the engine cleaned
recently.  O2 sensor is still the original.  Any suggestions would be
appreciated.
1990 325is Alpine White 85,000 miles; Eibach + Bilstein Sport; K&N.