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It would seem I am having a similar issue in my 2000 ML320. It starts fine but idles quite roughly when I am sitting in park, or at a stoplight. I was just recently informed that the serpentine belt tensioner needed to be replaced and I have the parts for both the belt and the tensioner. I think this problem with the idle is new. Could it be bad fuel? I guess I'm looking for the most inexpensive place to start troubleshooting. Thanks in advance guys!!!
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1993 300D 2.5 Turbo
Daily Driver.... 238,000 miles and counting (Gone for an '03 Camry)
2000 ML-320
New Daily Driver...139,xxx and still in one piece...
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