I had some stalling issues with my E30 and from some symptoms i read that it was the external fuel pump. It's been really noisy so I thought it was the culprit and/or a clogged fuel filter. I did a quick summary of what to do.

Picked parts up from amazon:

fuel pump with lifetime warranty: http://amzn.to/2m0B12N

bosch fuel filter (oem quality): http://amzn.to/2l1Iij3


** problem ended up being a bad fusible link near the battery. it cut off power to the ecu causing the stall**