Got my car back today! Fixed! It was the spark plugs. I used to get a weird surging feel at a light to & now it seems to have been eliminated also! Thats crazy that the factory messed up like that(S*&^T happens?) Would an AMG engine assembler let that go by? Maybe my plugs were replaced w/ the wrong C280 plugs recently???? The dealer didnt charge me for the fix this time around & since they can't find my old mass air meter They have offered to credit me 1/2 off the MAF(around $350-$400 for it) as a concession also. A new MAF wouldnt hurt things I guess?