Go to an autozone and get the codes pulled. It is free. They'll tell you what component may be bad.
Does it run real rough before it dies, or it simply quites running? Does it idle ok once it is fully warmed up - i.e. 80c?

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Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport