How smooth do you find the car idles, I don't find mine is super smooth as such , having said that it doesn't misfire as it were it's just that you can feel it through the seats if you know what I mean and notice it more after about 10 secs or there abouts after I come to a stop, my last car was a Focus and with that you couldn't feel anything on idle so much so that sometimes I thought it had cut out!! as it was so smooth, other than that these Vectras are quite a joy to drive it has to be said!!
Cheers Pete