Robert, There are three versions of the Bosch idle speed motor. Although they look different they all operate under the same specifications. The factory installed version found in all DeLoreans was finished in black specifically for the DeLorean application. The condition you are describing has nothing to do with the idle speed motor, if the idle speed drops excessively than the throttle stop screw is out of calibration. The Bosch model number for all versions is the same i.e.: 0 280140 500 there, is an additional number i.e.: 146 for black (early) and 745 for gold (late). "We're here to help you" DMC Help / De Lorean Services / <dmchelp@xxxx> Web Site: <www.deloreanservices.com> ----- Original Message ----- From: Robert Rooney <DMCVegas@xxxx> To: <dmcnews@xxxxxxxxxxx> Sent: Wednesday, November 08, 2000 5:23 PM Subject: [DML] Idle speed regulator question. 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