Automatic Shuddering when slowing to stop

[Craig]

Sometimes when I first turn my car on, when slowing to a stop I can feel something weird. If I drop it into manual mode, the car will actually shudder as I slow to a stop. If I'm sitting at a traffic light and roll up a bit, then slow down, it feels as if the engine kicks off. I haven't noticed a large dip in my RPM when it happens which is strange, but it sure feels that way.

Also this only happens when the car is cold, and not every single time I turn it on. I don't want to drop my car off at a dealership for an undisclosed amount of time for them to play with it because I don't trust them to actually look for a problem, and not just drive it around for fun. I'd like to be sure there's a problem that's been addressed so I can walk in with enough knowledge to describe the problem, and the solution.

~Thanks

PS: I posted this in the master CEL/Idle dip post but I doubt it'll get any traction there so I'm posting here. CEL isn't on nor am I getting the Idle dip as stated in that thread.