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Pulsating idle 90 325i

>
Tony Recently wrote:

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.
>
First check for ANY Vacuum leaks then,
2 culprits probably at work here. 85,000 miles on original 02 sensor is a
stretch. Bosch reccomends replacement @ 60k or so dep on fuel used etc etc.
I'd start with a new sensor
  (BTW we sell the 4-wire BOSCH EZ-Fit Tip Kit for your car (4-wire) for
just $69.95.) That could be your problem OR the next area is the electronic
IDLE CONTROL VALVE under the hood, Large Black Valve mounted up top with a 3
prong Electrical connector. This device regulates the air into the
system.New Bosch valve BMW LIST $120 Your cost $89.Hope this helps! Earlier
Model BMW's use a smaller valve & different Idle control module. Your Idle
Control Module is now built-in to the Motronic brain box. Pray that it is'nt
in the brainbox itself. E-X-P-E-N-S-I-V-E.  Rodd Sidney Da Parts Guy !! 
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Rodd Sidney                BMW Dealer Marketing Web Page
bmwrodd@domain.elided        http://www.dzn.com/global/bmw.htm