BMW Repair: E46 M54B25 Wont Start, crankshaft position sensor, leak down test

Question
I've had minor intermittent stalling issues. Usually the car would start back up again. This past weekend I was on the freeway, my car lost power and rpm dropped very briefly and kept driving normal. About a mile later i hit traffic and was going slow, the engine stalled and wouldnt start up again. Ive replaced the Fuel Pump, Fuel Filter, Intake Camshaft Sensor, and Crankshaft Position Sensor. Still no start. It cranks but doesnt start. What could this be?

2001 325Ci

Answer
You need now to start at the basics.Check fuel pressure,check compression,cylinder leak down test.Scan for codes(after you clear those you've added from replacing all previous parts)Checking all of these should help out much more than replacing part.Check your body grounds,they do wear with time.