unplug your maf and see if it starts. also, make sure none of your o2 wires are pinched.

it would be really helpful to plug into a real diag tool. starts then dies immediately can be an EWS or maybe DME issue.

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2011 M3
2006 Sierra 2500HD 4WD LBZ/Allison
2004 X5 3.0i 6MT
1995 M3 S50B32
1990 325is
1989 M3 S54B32

Hers:
1989 325iX
1996 911 Turbo