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I have had the same exact issue with my w124. It only occurred when stopped and seemed to be more prevalent when the climate control had the ac running. My car recently failed to start and it turns out my OVP had failed. I am not sure if this was causing the intermittent stumbling issue at idle. So far though I haven't had the condition re-occur. I will have to give it a week or two more to see if the stumbling idle condition is gone.
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 1999 SL500 87K
1994 E320 112K
1998 Ford Ranger - the daily driver 274K and no major repairs (an indestructible truck)
1978 Pontiac Trans Am 110K
1977 Pontiac Trans Am 130K
1999 SL500 87K (the garage queen, only out in the summer)
Last edited by skybound; 12-20-2015 at 03:47 PM.
Reason: Edit grammar
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