dewdaltz

Two months after they replaced my balance shaft my R starts to jerk (once in a 3-5 mins interval and random) a little bit when idling. Mostly, I can feel it on the engine area. I dont know if this jerking motion is in relation to the balance shaft replacement. I did complain this to my advisor two weeks after I was feeling it but they said they cannot find any codes. Right now, my R has 112640 miles already. I remember it was 90000 miles when I change the spark plugs. Any thoughts on this jerking thing. Please let me know, thanks.