Title says it all. I acquired a 1994 DB8 with a B18B1 in it. On cold start up the car Idles around 2,000 RPM. After running for a bit it will go down to around 8 to 900, but at a stop it surges sometimes between 900 to as high as 1600 or so. At first I thought it was a vacuum leak but i'm not sure at this point. Any help would be great. Thanks