I am a very anylitical and technical person, and I always wonder if this type of issue will cause a loss of performance.

With mine, I can feel a perfect beat to this shudder so one would assume that it is the unequal firing of one cylinder while under an idle condition. If this is the case, there is an issue with the combustion process in this cylinder. I affraid this will cause a performance issue in the end.

I'm sure it will be a waste of time taking to the dealer. I find you are better taking these matters into your own hands. I will do what I can to look at this problem. I will replace all of the plugs and make sure they are gapped correctly. If I get crazy I will do a compression check.

It is minor but annoying.

I hope that the resolution is simple.

Cheers,