328i odd vibration for a second and rpm drop
car: 2007 328i E92
I'm stuck with this weird problem I just started experiencing right after I replaced all my brake pads and changed the oil (to mobil 1 5w30 full syn) Even though this maintenance was performed, I can't see ANY RELATION whatsoever to the problem.
The problem is that when the car is idling, there is a vibration (which is also audible) of the engine and slight rpm drop of maybe 100-200 all within a second, maximum two seconds and then it returns to normal.
I cannot consistently recreate the problem, it comes and goes, but it seems to happen more when I "do" something while in idle like switching to D or R and holding the brake, and or steer in place. Or simply driving and then stopping at a stop light while holding the brake.
what could this possibly be?