My symptoms were very similar, but I was getting a code 5 on the DM and code 13 on pin 8. All mine ended up being was the spark plugs. $12 at NAPA. Crazy *****, ain't it Judy?

Best Regards,
Rob

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Robert Fini

'12 ML350 BlueTec, 87k
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'84 190E-2.3/5spd (Stage Rally Racer)
'66 230 W110 Sedan (Barn Find, Vintage Racer build in progress)