"06 impreza wagon, with manual tranny. when engaged in 1st and 2nd gears, if you release the throttle, at aroune 1000rpm, the car will jerk bouncily. It only happens in 1st and 2nd gear, not in 3rd or 4th.
btw, during cold start idling, you will hear a click sound, then the idling RPM goes up a bit, then gradually fall back, then you heard another click,it goes up a bit a gain.... but only in cold start.
BTW, I've stalled the car a lots of time from station to move, will it affect the car? only bought it for 2 days."
Sounds to me like you are operating the engine at too low an rpm. This engine isn't really comfortable operating at less than 1500 rpm, if there is any load. Of course, in first gear, you can go a bit lower in rpm. However, your comment about frequent stalling leads me to think you are not operating in it's "comfortable" range. Maybe try a bit more rpm pulling away?
The clutch in Impreza's is a bit abrupt, but some more practice should eliminate any problems you are now having.
Larry Van Wormer