Basically what's going on is anytime around 2000 - 3000 rpms, I can feel a good vibration from the engine bay. It's not severe but I can feel it in the clutch pedal. It started after I backed my car up an incline and the whole motor started shaking from a bad motor mount (haven't had the time or location to do it till this coming weekend.) Maybe the balance shafts are out of whack? I don't notice any hesitation with acceleration or knocking sounds. I haven't checked the integrity of my BS belt either.