Very subtle shaking on clk550
About a month ago I got cam plugs changed on my clk550 and do to the mechanics fault of not installing the engine cover properly my car was idling rough hence shaking the car. With your guys help and suggestions I had them re install the engine cover which made the car a lot better.
But today I noticed very subtle shaking at idle, I mean you really have to look out for the shaking and stay still to notice it.
Since I never sat in or test drove another clk550, Is this normal or do I have to take the car back to get it looked at?
I mean should the car be completely shake free

Car drives fine otherwise and now has approx 21500 miles
Thanks in advance for your input
But when I get on it-no stumble, no missfire, it just flies.
I think its kinda cool
26K miles
My main question is that does anyone feel the slightest shake when there vehicle is in park or is your vehicle 100% smooth and shake free on idle?
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