it idles good, but when i put it in gear, it shakes a little, then it becomes smooth, it shakes a little more, and so on. I can see the rpm go up and down by 100-200. Say you are doing 20km/h, and you punch it, it backfires and barely goes. Once it's in the higher RPM's it stops doing it. As the RPM drops below 2k, if you punch it again, it will hesitate and stumble some more, until its at the right RPM.