i have 05 automatically with 12k miles, car slightly vibrates along with the rhythm of exhausts while idling. just a little bit, is it normal?

 

I'm no mechanic, but is it possible you have a loose exhaust mount?

 

when i shift to neutral it stop the vibration, it only happens once a while, could it be exhaust problem or it just normal?

 

Motor mts?

 

should i take it to the dealer?

 

I also feel the slight shake here and there when stoped at the red light or something, but I have a 6MT. As long as the car runs fine I don't think it's a major problem.
Is everybody else's car really still when idling?