Help with Fuel Pressure Regulator

invalid@example.com (method0075), method0075
Mon, 10 Nov 2008 13:20:37 +0000

So I have a 1992 e34 535 that is running very rich I think. When I come to a stop and idle for about 10 secs. the car grows very rough and feels as if a cylinder or two are flooding. I'm thinking it`s a FPR. I disconnected the vacum line to it and drove it with no change compared to with the vacum hooked up. So how do I test the FPR as these are close to 100 dollars each. Thanks.