I went for another drive and while video recording I noticed that it only happens when the rear end of the car goes over a good sized bump or pot hole. The video was shot with my cell phone but you can get the idea of when I hit a large bump and it stalls.

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Primered Black 92' 325i. Ireland Engineering Header, Ireland Engineering Catback, TMS Underdrive pulleys, TMS chip, Bav auto fpr, Power Flow cai, Bav auto coil packs, Cool Carbon pads, Eiback springs, Bilstien Sport HD shocks/struts, 3.23 LSD, Understeer short shifter, 16'' Spal Fan, Goodridge Steel Brakelines, M3 Bumper, Black out grill, clear tails, M3 mirrors.