Thump and pull when coasting.
I hope you can help me with an issue with my 2004 645ci. A couple of days ago I noticed that when going at 30 mph and barely putting any pressure on the gas, sort of coasting, there is a slight thump noise with a slight pull. It feels like a very small stall in the engine that last a second and affects the pull of the car. It's almost imperceptible, but if you pay attention it clearly is there. My wife heard when I asked her to pay attention, so that means it's real but if I did not tell her about it she probably would not have noticed. The noise seems to come from the rear of the car though and not the front. It comes at regular intervals about 5 seconds apart and if a step on the gas even a little, it goes away. I have an automatic transmission with the sport package and the car has 51,000 miles.