Bump - does anybody have any ideas for my kid?

Something he didn't add - he recently fueled it up. I suggested he buy a new fuel filter, which he did, and he is now towing it over to a freind's place so they can work on it.

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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