When I travel in city around 40-50 mph, my engine makes louder noise and the RPM seems stuck at 3000 for awhile before it shifts. I can feel more vibration come through the pedals and the floor. I can feel there is something unusual in the engine noise. It feels like there is not 100% performance. Hope this makes sense to you. I don't know how to describe that feeling and that noise. Like being hold back when you try to run with all force. However, when I travel at higher speed, the x5 seems fine: no vibration, no feeling of stuck RPM, no loud noise, accelerate smoothly. Does anyone have this problem before. My car has the SES on with the code P0369.

ALX5