Fuel pump relay (located behind the battery against the firewall on the passenger's side)? Just a thought. My 300E would start, sometimes stall, wouldn't start, etc., until I changed that little guy.

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David

His:
2003 Dodge Durango SLT
2002 BMW E39 530i Sport
1988 Mercedes 300TE
Hers:
2003 Chevrolet Suburban
1999 E430