Idle speed regulator question.

["Robert Rooney" <DMCVegas@xxxx>]

I have a question about the idle speed regulator. On all the 
DeLorean's that I've looked at, I've noticed that there are 2 
versions of the idle speed regulator: A black one, and a gold/brass 
colored one. On every DeLorean I've seen that has the black on 
installed (including mine), the engine comes down quickly from a rev, 
then dips below 700 rpm's. When the happens the engine always 
shutters and almost dies. Most time it is so bad that the alternator 
warning light will sometimes illuminate. On the car's w/the gold 
colored units, the engine always comes down gently to it's idle and 
never goes below 750± rpm's. My question is this: 1. Does anyone know 
the BOSCH # for this 2nd version? 2. Which version do the parts 
suppliers ship?

-Robert
vin 6585