Jay (aka babyjames) has a good plan. Basically it is splitting the fuel system in half to close in on where the trouble is. If it runs ok before it dies, I'm thinking it is fuel related, but if it runs crappy on a known good fuel source and pump, then it is most likely an IP/timing issue.

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2012 Mercedes ML350 Bluetec 91K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 231K (mine)
1998 Volvo S70 T5 Turbo 196K (kids)
1994 Ford F150 4WD 249K (firewood hauler)
1983 Mercedes 300D 376K (diesel commuter)