| Had both those problems. I solved my hesitation with the correct spark plugs but consider vacuum leaks, the DISA or VANOS. I've had coil packs done too but only because one completely failed.
I solved my vibration by having the idle raised, nice and easy permanent band aid fix was only by 100rpm and it solved it. I suspect VACUUM leaks but will have that solved in two weeks.
If you need anything I've got a library of part numbers for the systems in the 330i/Ci.
Last edited by trive2; 01-13-2013 at 04:49 AM.