I just took a set of platnium +4s out of my 300E and put in the correct H9DCO plugs and the intermittant rough idle seems to be gone. I did not realize my independant mech had put in the +4s
over two years ago and have suffered with the rough idle ever since.

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Dave
88 300E 250K Sold
2000 C230K Totaled @104K
2003 ML320 156K Sold
2009 E350 4Matic Sport 46K Sold
2011 ML350 60K Sold
2014 GLK350 46k Sold
2012 GL450 72K For Sale
2016 E550 Cabriolet 48K Sold
2015 GLK350 114K