JessiesM1,
I am having the same symptoms (as listed in your original post) on my 1998 ML320 with 205k miles which I have owned since new. What finally corrected the problem for you?
Thanks,
Ken

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2014 E250 Bluetec 4-Matic
2014 GL350 Bluetec 4-Matic
1996 Chevy Tahoe 4 x 4
2009 ML350 (sold)
2005 SLK350 (sold)
1999 E300 Turbodiesel (sold)
1998 ML320 (sold)
1991 300D 2.5 Turbodiesel (sold)